87718957 has 2 divisors, whose sum is σ = 87718958. Its totient is φ = 87718956.

The previous prime is 87718951. The next prime is 87718973. The reversal of 87718957 is 75981778.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 48706441 + 39012516 = 6979^2 + 6246^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-87718957 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (87718951) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 43859478 + 43859479.

It is an arithmetic number, because the mean of its divisors is an integer number (43859479).

Almost surely, 2^87718957 is an apocalyptic number.

It is an amenable number.

87718957 is a deficient number, since it is larger than the sum of its proper divisors (1).

87718957 is an equidigital number, since it uses as much as digits as its factorization.

87718957 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 987840, while the sum is 52.

The square root of 87718957 is about 9365.8398982686. The cubic root of 87718957 is about 444.3220025048.

The spelling of 87718957 in words is "eighty-seven million, seven hundred eighteen thousand, nine hundred fifty-seven".