87720507 has 24 divisors (see below), whose sum is σ = 145516800. Its totient is φ = 49880880.

The previous prime is 87720499. The next prime is 87720509. The reversal of 87720507 is 70502778.

87720507 is a `hidden beast` number, since 87 + 72 + 0 + 507 = 666.

It is not a de Polignac number, because 87720507 - 2³ = 87720499 is a prime.

It is not an unprimeable number, because it can be changed into a prime (87720509) by changing a digit.

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 23 ways as a sum of consecutive naturals, for example, 9994 + ... + 16592.

It is an arithmetic number, because the mean of its divisors is an integer number (6063200).

Almost surely, 2^87720507 is an apocalyptic number.

87720507 is a deficient number, since it is larger than the sum of its proper divisors (57796293).

87720507 is a wasteful number, since it uses less digits than its factorization.

87720507 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6823 (or 6820 counting only the distinct ones).

The product of its (nonzero) digits is 27440, while the sum is 36.

The square root of 87720507 is about 9365.9226454205. The cubic root of 87720507 is about 444.3246195562.

The spelling of 87720507 in words is "eighty-seven million, seven hundred twenty thousand, five hundred seven".