87038989 has 2 divisors, whose sum is σ = 87038990. Its totient is φ = 87038988.

The previous prime is 87038957. The next prime is 87038999. The reversal of 87038989 is 98983078.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 86174089 + 864900 = 9283^2 + 930^2 .

It is a cyclic number.

It is not a de Polignac number, because 87038989 - 2⁵ = 87038957 is a prime.

It is a super-2 number, since 2×87038989² = 15151571212284242, which contains 22 as substring.

It is an alternating number because its digits alternate between even and odd.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (87038909) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 43519494 + 43519495.

It is an arithmetic number, because the mean of its divisors is an integer number (43519495).

Almost surely, 2^87038989 is an apocalyptic number.

It is an amenable number.

87038989 is a deficient number, since it is larger than the sum of its proper divisors (1).

87038989 is an equidigital number, since it uses as much as digits as its factorization.

87038989 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 870912, while the sum is 52.

The square root of 87038989 is about 9329.4688487609. The cubic root of 87038989 is about 443.1709446653.

The spelling of 87038989 in words is "eighty-seven million, thirty-eight thousand, nine hundred eighty-nine".