87931309772 has 24 divisors (see below), whose sum is σ = 157649632560. Its totient is φ = 42888784640.

The previous prime is 87931309771. The next prime is 87931309841. The reversal of 87931309772 is 27790313978.

It is not an unprimeable number, because it can be changed into a prime (87931309771) 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 7 ways as a sum of consecutive naturals, for example, 1943504 + ... + 1988232.

It is an arithmetic number, because the mean of its divisors is an integer number (6568734690).

Almost surely, 2^87931309772 is an apocalyptic number.

87931309772 is a gapful number since it is divisible by the number (82) formed by its first and last digit.

It is an amenable number.

87931309772 is a deficient number, since it is larger than the sum of its proper divisors (69718322788).

87931309772 is a wasteful number, since it uses less digits than its factorization.

87931309772 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 56761 (or 56759 counting only the distinct ones).

The product of its (nonzero) digits is 4000752, while the sum is 56.

The spelling of 87931309772 in words is "eighty-seven billion, nine hundred thirty-one million, three hundred nine thousand, seven hundred seventy-two".