87694657 has 2 divisors, whose sum is σ = 87694658. Its totient is φ = 87694656.

The previous prime is 87694601. The next prime is 87694679. The reversal of 87694657 is 75649678.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 69239041 + 18455616 = 8321^2 + 4296^2 .

It is a cyclic number.

It is not a de Polignac number, because 87694657 - 2²³ = 79306049 is a prime.

It is not a weakly prime, because it can be changed into another prime (87694697) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 43847328 + 43847329.

It is an arithmetic number, because the mean of its divisors is an integer number (43847329).

Almost surely, 2^87694657 is an apocalyptic number.

It is an amenable number.

87694657 is a deficient number, since it is larger than the sum of its proper divisors (1).

87694657 is an equidigital number, since it uses as much as digits as its factorization.

87694657 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2540160, while the sum is 52.

The square root of 87694657 is about 9364.5425408826. The cubic root of 87694657 is about 444.2809698623.

The spelling of 87694657 in words is "eighty-seven million, six hundred ninety-four thousand, six hundred fifty-seven".