87645138 has 32 divisors (see below), whose sum is σ = 210877440. Its totient is φ = 23723280.

The previous prime is 87645133. The next prime is 87645139. The reversal of 87645138 is 83154678.

It is a Harshad number since it is a multiple of its sum of digits (42).

It is a self number, because there is not a number n which added to its sum of digits gives 87645138.

It is not an unprimeable number, because it can be changed into a prime (87645133) 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, 54118 + ... + 55713.

It is an arithmetic number, because the mean of its divisors is an integer number (6589920).

Almost surely, 2^87645138 is an apocalyptic number.

87645138 is an abundant number, since it is smaller than the sum of its proper divisors (123232302).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

87645138 is a wasteful number, since it uses less digits than its factorization.

87645138 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 109862.

The product of its digits is 161280, while the sum is 42.

The square root of 87645138 is about 9361.8982049582. The cubic root of 87645138 is about 444.1973292985.

The spelling of 87645138 in words is "eighty-seven million, six hundred forty-five thousand, one hundred thirty-eight".