87890657 has 2 divisors, whose sum is σ = 87890658. Its totient is φ = 87890656.

The previous prime is 87890623. The next prime is 87890669. The reversal of 87890657 is 75609878.

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., 85673536 + 2217121 = 9256^2 + 1489^2 .

It is a cyclic number.

It is not a de Polignac number, because 87890657 - 2¹⁴ = 87874273 is a prime.

It is not a weakly prime, because it can be changed into another prime (87890617) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 43945328 + 43945329.

It is an arithmetic number, because the mean of its divisors is an integer number (43945329).

Almost surely, 2^87890657 is an apocalyptic number.

It is an amenable number.

87890657 is a deficient number, since it is larger than the sum of its proper divisors (1).

87890657 is an equidigital number, since it uses as much as digits as its factorization.

87890657 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 846720, while the sum is 50.

The square root of 87890657 is about 9375.0017066665. The cubic root of 87890657 is about 444.6117170206.

The spelling of 87890657 in words is "eighty-seven million, eight hundred ninety thousand, six hundred fifty-seven".