280972990 has 16 divisors (see below), whose sum is σ = 506299248. Its totient is φ = 112267456.

The previous prime is 280972987. The next prime is 280972999. The reversal of 280972990 is 99279082.

It is a super-2 number, since 2×280972990² = 157891642219080200, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 280972990.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (280972999) 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, 5212 + ... + 24271.

It is an arithmetic number, because the mean of its divisors is an integer number (31643703).

Almost surely, 2^280972990 is an apocalyptic number.

280972990 is a deficient number, since it is larger than the sum of its proper divisors (225326258).

280972990 is a wasteful number, since it uses less digits than its factorization.

280972990 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30443.

The product of its (nonzero) digits is 163296, while the sum is 46.

The square root of 280972990 is about 16762.2489541231. The cubic root of 280972990 is about 654.9701752051.

The spelling of 280972990 in words is "two hundred eighty million, nine hundred seventy-two thousand, nine hundred ninety".