280430664 has 32 divisors (see below), whose sum is σ = 712573440. Its totient is φ = 91944000.

The previous prime is 280430663. The next prime is 280430687. The reversal of 280430664 is 466034082.

280430664 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a super-2 number, since 2×280430664² = 157282714622961792, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (280430663) 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, 94312 + ... + 97239.

It is an arithmetic number, because the mean of its divisors is an integer number (22267920).

Almost surely, 2^280430664 is an apocalyptic number.

280430664 is a gapful number since it is divisible by the number (24) formed by its first and last digit.

It is an amenable number.

280430664 is an abundant number, since it is smaller than the sum of its proper divisors (432142776).

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

280430664 is a wasteful number, since it uses less digits than its factorization.

280430664 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 191621 (or 191617 counting only the distinct ones).

The product of its (nonzero) digits is 27648, while the sum is 33.

The square root of 280430664 is about 16746.0641345959. The cubic root of 280430664 is about 654.5485022445.

The spelling of 280430664 in words is "two hundred eighty million, four hundred thirty thousand, six hundred sixty-four".