280638490 has 32 divisors (see below), whose sum is σ = 554408064. Its totient is φ = 101432640.

The previous prime is 280638469. The next prime is 280638497. The reversal of 280638490 is 94836082.

280638490 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is not an unprimeable number, because it can be changed into a prime (280638497) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 10732 + ... + 26008.

It is an arithmetic number, because the mean of its divisors is an integer number (17325252).

Almost surely, 2^280638490 is an apocalyptic number.

280638490 is a deficient number, since it is larger than the sum of its proper divisors (273769574).

280638490 is a wasteful number, since it uses less digits than its factorization.

280638490 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15462.

The product of its (nonzero) digits is 82944, while the sum is 40.

The square root of 280638490 is about 16752.2682046343. The cubic root of 280638490 is about 654.7101567091.

The spelling of 280638490 in words is "two hundred eighty million, six hundred thirty-eight thousand, four hundred ninety".