787957681 has 6 divisors (see below), whose sum is σ = 916603890. Its totient is φ = 675392256.

The previous prime is 787957669. The next prime is 787957691. The reversal of 787957681 is 186759787.

It can be written as a sum of positive squares in only one way, i.e., 747202225 + 40755456 = 27335^2 + 6384^2 .

It is not a de Polignac number, because 787957681 - 2⁵ = 787957649 is a prime.

It is a super-2 number, since 2×787957681² = 1241754614093795522, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (787957601) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 8040336 + ... + 8040433.

It is an arithmetic number, because the mean of its divisors is an integer number (152767315).

Almost surely, 2^787957681 is an apocalyptic number.

It is an amenable number.

787957681 is a deficient number, since it is larger than the sum of its proper divisors (128646209).

787957681 is a wasteful number, since it uses less digits than its factorization.

787957681 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16080783 (or 16080776 counting only the distinct ones).

The product of its digits is 5927040, while the sum is 58.

The square root of 787957681 is about 28070.5839091388. The cubic root of 787957681 is about 923.6362395806.

The spelling of 787957681 in words is "seven hundred eighty-seven million, nine hundred fifty-seven thousand, six hundred eighty-one".