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242780 = 22561199
BaseRepresentation
bin111011010001011100
3110100000212
4323101130
530232110
65111552
72030546
oct732134
9410025
10242780
1115644a
12b85b8
1386675
1464696
154be05
hex3b45c

242780 has 24 divisors (see below), whose sum is σ = 520800. Its totient is φ = 95040.

The previous prime is 242779. The next prime is 242789. The reversal of 242780 is 87242.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (242789) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1121 + ... + 1319.

It is an arithmetic number, because the mean of its divisors is an integer number (21700).

2242780 is an apocalyptic number.

242780 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

242780 is an abundant number, since it is smaller than the sum of its proper divisors (278020).

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

242780 is a wasteful number, since it uses less digits than its factorization.

242780 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 269 (or 267 counting only the distinct ones).

The product of its (nonzero) digits is 896, while the sum is 23.

The square root of 242780 is about 492.7271049983. The cubic root of 242780 is about 62.3836769709.

The spelling of 242780 in words is "two hundred forty-two thousand, seven hundred eighty".

Divisors: 1 2 4 5 10 20 61 122 199 244 305 398 610 796 995 1220 1990 3980 12139 24278 48556 60695 121390 242780