781116648 has 48 divisors (see below), whose sum is σ = 2114572320. Its totient is φ = 240342336.

The previous prime is 781116607. The next prime is 781116659. The reversal of 781116648 is 846611187.

It is a super-2 number, since 2×781116648² = 1220286435565511808, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 92236 + ... + 100347.

It is an arithmetic number, because the mean of its divisors is an integer number (44053590).

Almost surely, 2^781116648 is an apocalyptic number.

781116648 is a gapful number since it is divisible by the number (78) formed by its first and last digit.

It is an amenable number.

781116648 is an abundant number, since it is smaller than the sum of its proper divisors (1333455672).

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

781116648 is a wasteful number, since it uses less digits than its factorization.

781116648 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 192618 (or 192601 counting only the distinct ones).

The product of its digits is 64512, while the sum is 42.

The square root of 781116648 is about 27948.4641438488. The cubic root of 781116648 is about 920.9554692283.

The spelling of 781116648 in words is "seven hundred eighty-one million, one hundred sixteen thousand, six hundred forty-eight".