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285504380 = 22572291331
BaseRepresentation
bin10001000001000…
…111001101111100
3201220020010101022
4101001013031330
51041042120010
644155203312
710034514200
oct2101071574
9656203338
10285504380
11137183737
127b746538
13471c3c05
1429cbcb00
151a0e8d55
hex1104737c

285504380 has 36 divisors (see below), whose sum is σ = 697448808. Its totient is φ = 97886880.

The previous prime is 285504371. The next prime is 285504397. The reversal of 285504380 is 83405582.

It is a Harshad number since it is a multiple of its sum of digits (35).

It is a self number, because there is not a number n which added to its sum of digits gives 285504380.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 144686 + ... + 146645.

It is an arithmetic number, because the mean of its divisors is an integer number (19373578).

Almost surely, 2285504380 is an apocalyptic number.

285504380 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

285504380 is an abundant number, since it is smaller than the sum of its proper divisors (411944428).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

285504380 is a wasteful number, since it uses less digits than its factorization.

285504380 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 291354 (or 291345 counting only the distinct ones).

The product of its (nonzero) digits is 38400, while the sum is 35.

The square root of 285504380 is about 16896.8748589791. The cubic root of 285504380 is about 658.4724236727.

The spelling of 285504380 in words is "two hundred eighty-five million, five hundred four thousand, three hundred eighty".

Divisors: 1 2 4 5 7 10 14 20 28 35 49 70 98 140 196 245 490 980 291331 582662 1165324 1456655 2039317 2913310 4078634 5826620 8157268 10196585 14275219 20393170 28550438 40786340 57100876 71376095 142752190 285504380