781404672 has 40 divisors (see below), whose sum is σ = 2081714976. Its totient is φ = 260467712.

The previous prime is 781404647. The next prime is 781404703. The reversal of 781404672 is 276404187.

It is a super-2 number, since 2×781404672² = 1221186522846855168, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 781404672.

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 3 ways as a sum of consecutive naturals, for example, 252828 + ... + 255899.

Almost surely, 2^781404672 is an apocalyptic number.

It is an amenable number.

781404672 is an abundant number, since it is smaller than the sum of its proper divisors (1300310304).

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

781404672 is an equidigital number, since it uses as much as digits as its factorization.

781404672 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 508748 (or 508732 counting only the distinct ones).

The product of its (nonzero) digits is 75264, while the sum is 39.

The square root of 781404672 is about 27953.6164386650. The cubic root of 781404672 is about 921.0686510782.

The spelling of 781404672 in words is "seven hundred eighty-one million, four hundred four thousand, six hundred seventy-two".