285253780 has 48 divisors (see below), whose sum is σ = 686125440. Its totient is φ = 97584768.

The previous prime is 285253777. The next prime is 285253781. The reversal of 285253780 is 87352582.

It is a super-3 number, since 3×285253780³ (a number of 26 digits) contains 333 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (285253781) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 69259 + ... + 73261.

It is an arithmetic number, because the mean of its divisors is an integer number (14294280).

Almost surely, 2^285253780 is an apocalyptic number.

285253780 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

285253780 is an abundant number, since it is smaller than the sum of its proper divisors (400871660).

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

285253780 is a wasteful number, since it uses less digits than its factorization.

285253780 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4528 (or 4526 counting only the distinct ones).

The product of its (nonzero) digits is 134400, while the sum is 40.

The square root of 285253780 is about 16889.4576585514. The cubic root of 285253780 is about 658.2797103505.

The spelling of 285253780 in words is "two hundred eighty-five million, two hundred fifty-three thousand, seven hundred eighty".