87596721 has 10 divisors (see below), whose sum is σ = 130854482. Its totient is φ = 58397760.

The previous prime is 87596713. The next prime is 87596753. The reversal of 87596721 is 12769578.

It can be written as a sum of positive squares in only one way, i.e., 65610000 + 21986721 = 8100^2 + 4689^2 .

It is not a de Polignac number, because 87596721 - 2³ = 87596713 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (87596711) by changing a digit.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 540640 + ... + 540801.

Almost surely, 2^87596721 is an apocalyptic number.

87596721 is a gapful number since it is divisible by the number (81) formed by its first and last digit.

It is an amenable number.

87596721 is a deficient number, since it is larger than the sum of its proper divisors (43257761).

87596721 is a wasteful number, since it uses less digits than its factorization.

87596721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1081453 (or 1081444 counting only the distinct ones).

The product of its digits is 211680, while the sum is 45.

The square root of 87596721 is about 9359.3119939449. The cubic root of 87596721 is about 444.1155196129.

The spelling of 87596721 in words is "eighty-seven million, five hundred ninety-six thousand, seven hundred twenty-one".