87731616 has 48 divisors (see below), whose sum is σ = 263196864. Its totient is φ = 25065984.

The previous prime is 87731599. The next prime is 87731621. The reversal of 87731616 is 61613778.

It is a tau number, because it is divible by the number of its divisors (48).

It is a nude number because it is divisible by every one of its digits.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 64605 + ... + 65948.

It is an arithmetic number, because the mean of its divisors is an integer number (5483268).

Almost surely, 2^87731616 is an apocalyptic number.

It is an amenable number.

87731616 is an abundant number, since it is smaller than the sum of its proper divisors (175465248).

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

87731616 is a wasteful number, since it uses less digits than its factorization.

87731616 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 130573 (or 130565 counting only the distinct ones).

The product of its digits is 42336, while the sum is 39.

The square root of 87731616 is about 9366.5156808709. The cubic root of 87731616 is about 444.3433753144.

The spelling of 87731616 in words is "eighty-seven million, seven hundred thirty-one thousand, six hundred sixteen".