87501665 has 16 divisors (see below), whose sum is σ = 107075520. Its totient is φ = 68629440.

The previous prime is 87501647. The next prime is 87501679. The reversal of 87501665 is 56610578.

It is a happy number.

It is not a de Polignac number, because 87501665 - 2¹⁸ = 87239521 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 89630 + ... + 90600.

It is an arithmetic number, because the mean of its divisors is an integer number (6692220).

Almost surely, 2^87501665 is an apocalyptic number.

It is an amenable number.

87501665 is a deficient number, since it is larger than the sum of its proper divisors (19573855).

87501665 is a wasteful number, since it uses less digits than its factorization.

87501665 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1312.

The product of its (nonzero) digits is 50400, while the sum is 38.

The square root of 87501665 is about 9354.2324645050. The cubic root of 87501665 is about 443.9548167776.

The spelling of 87501665 in words is "eighty-seven million, five hundred one thousand, six hundred sixty-five".