87398865 has 16 divisors (see below), whose sum is σ = 155376000. Its totient is φ = 46612656.

The previous prime is 87398851. The next prime is 87398869. The reversal of 87398865 is 56889378.

It is a happy number.

It is not a de Polignac number, because 87398865 - 2⁴ = 87398849 is a prime.

It is not an unprimeable number, because it can be changed into a prime (87398869) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 323565 + ... + 323834.

It is an arithmetic number, because the mean of its divisors is an integer number (9711000).

Almost surely, 2^87398865 is an apocalyptic number.

It is an amenable number.

87398865 is a deficient number, since it is larger than the sum of its proper divisors (67977135).

87398865 is a wasteful number, since it uses less digits than its factorization.

87398865 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 647413 (or 647407 counting only the distinct ones).

The product of its digits is 2903040, while the sum is 54.

The square root of 87398865 is about 9348.7360108199. The cubic root of 87398865 is about 443.7808907941.

The spelling of 87398865 in words is "eighty-seven million, three hundred ninety-eight thousand, eight hundred sixty-five".