87605657 has 2 divisors, whose sum is σ = 87605658. Its totient is φ = 87605656.

The previous prime is 87605633. The next prime is 87605701. The reversal of 87605657 is 75650678.

It is an a-pointer prime, because the next prime (87605701) can be obtained adding 87605657 to its sum of digits (44).

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 66113161 + 21492496 = 8131^2 + 4636^2 .

It is a cyclic number.

It is not a de Polignac number, because 87605657 - 2¹⁴ = 87589273 is a prime.

It is a super-2 number, since 2×87605657² = 15349502276803298, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (87605627) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 43802828 + 43802829.

It is an arithmetic number, because the mean of its divisors is an integer number (43802829).

Almost surely, 2^87605657 is an apocalyptic number.

It is an amenable number.

87605657 is a deficient number, since it is larger than the sum of its proper divisors (1).

87605657 is an equidigital number, since it uses as much as digits as its factorization.

87605657 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 352800, while the sum is 44.

The square root of 87605657 is about 9359.7893672881. The cubic root of 87605657 is about 444.1306209443.

The spelling of 87605657 in words is "eighty-seven million, six hundred five thousand, six hundred fifty-seven".