280640985728 has 32 divisors (see below), whose sum is σ = 559834115520. Its totient is φ = 140133600000.

The previous prime is 280640985727. The next prime is 280640985733. The reversal of 280640985728 is 827589046082.

It is a tau number, because it is divible by the number of its divisors (32).

It is not an unprimeable number, because it can be changed into a prime (280640985727) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1363598 + ... + 1555853.

It is an arithmetic number, because the mean of its divisors is an integer number (17494816110).

Almost surely, 2^280640985728 is an apocalyptic number.

It is an amenable number.

280640985728 is a deficient number, since it is larger than the sum of its proper divisors (279193129792).

280640985728 is an equidigital number, since it uses as much as digits as its factorization.

280640985728 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2920216 (or 2920204 counting only the distinct ones).

The product of its (nonzero) digits is 15482880, while the sum is 59.

The spelling of 280640985728 in words is "two hundred eighty billion, six hundred forty million, nine hundred eighty-five thousand, seven hundred twenty-eight".