280385672 has 32 divisors (see below), whose sum is σ = 604672320. Its totient is φ = 119396160.

The previous prime is 280385639. The next prime is 280385681. The reversal of 280385672 is 276583082.

It is a super-2 number, since 2×280385672² = 157232250125783168, which contains 22 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 7154 + ... + 24737.

It is an arithmetic number, because the mean of its divisors is an integer number (18896010).

Almost surely, 2^280385672 is an apocalyptic number.

It is an amenable number.

280385672 is an abundant number, since it is smaller than the sum of its proper divisors (324286648).

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

280385672 is a wasteful number, since it uses less digits than its factorization.

280385672 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 32061 (or 32057 counting only the distinct ones).

The product of its (nonzero) digits is 161280, while the sum is 41.

The square root of 280385672 is about 16744.7207202748. The cubic root of 280385672 is about 654.5134953485.

The spelling of 280385672 in words is "two hundred eighty million, three hundred eighty-five thousand, six hundred seventy-two".