87617857 has 2 divisors, whose sum is σ = 87617858. Its totient is φ = 87617856.

The previous prime is 87617837. The next prime is 87617897. The reversal of 87617857 is 75871678.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 67223601 + 20394256 = 8199^2 + 4516^2 .

It is a cyclic number.

It is not a de Polignac number, because 87617857 - 2¹⁹ = 87093569 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 87617857.

It is not a weakly prime, because it can be changed into another prime (87617837) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 43808928 + 43808929.

It is an arithmetic number, because the mean of its divisors is an integer number (43808929).

Almost surely, 2^87617857 is an apocalyptic number.

It is an amenable number.

87617857 is a deficient number, since it is larger than the sum of its proper divisors (1).

87617857 is an equidigital number, since it uses as much as digits as its factorization.

87617857 is an evil number, because the sum of its binary digits is even.

The product of its digits is 658560, while the sum is 49.

The square root of 87617857 is about 9360.4410686677. The cubic root of 87617857 is about 444.1512365919.

The spelling of 87617857 in words is "eighty-seven million, six hundred seventeen thousand, eight hundred fifty-seven".