280985656 has 32 divisors (see below), whose sum is σ = 637532640. Its totient is φ = 113338368.

The previous prime is 280985633. The next prime is 280985657. The reversal of 280985656 is 656589082.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (280985657) 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, 146625 + ... + 148528.

It is an arithmetic number, because the mean of its divisors is an integer number (19922895).

Almost surely, 2^280985656 is an apocalyptic number.

It is an amenable number.

280985656 is an abundant number, since it is smaller than the sum of its proper divisors (356546984).

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

280985656 is a wasteful number, since it uses less digits than its factorization.

280985656 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 295183 (or 295179 counting only the distinct ones).

The product of its (nonzero) digits is 1036800, while the sum is 49.

The square root of 280985656 is about 16762.6267631299. The cubic root of 280985656 is about 654.9800168718.

It can be divided in two parts, 2809856 and 56, that multiplied together give a 4-th power (157351936 = 112⁴).

The spelling of 280985656 in words is "two hundred eighty million, nine hundred eighty-five thousand, six hundred fifty-six".