781320988 has 12 divisors (see below), whose sum is σ = 1562642032. Its totient is φ = 334851840.

The previous prime is 781320979. The next prime is 781321027. The reversal of 781320988 is 889023187.

781320988 is an admirable number.

It is a super-2 number, since 2×781320988² = 1220924972578592288, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 13952133 + ... + 13952188.

Almost surely, 2^781320988 is an apocalyptic number.

It is an amenable number.

781320988 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

781320988 is a wasteful number, since it uses less digits than its factorization.

781320988 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27904332 (or 27904330 counting only the distinct ones).

The product of its (nonzero) digits is 193536, while the sum is 46.

The square root of 781320988 is about 27952.1195618508. The cubic root of 781320988 is about 921.0357694982.

The spelling of 781320988 in words is "seven hundred eighty-one million, three hundred twenty thousand, nine hundred eighty-eight".