87209138 has 16 divisors (see below), whose sum is σ = 137253120. Its totient is φ = 41504400.

The previous prime is 87209093. The next prime is 87209141. The reversal of 87209138 is 83190278.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 7748 + ... + 15311.

It is an arithmetic number, because the mean of its divisors is an integer number (8578320).

Almost surely, 2^87209138 is an apocalyptic number.

87209138 is a deficient number, since it is larger than the sum of its proper divisors (50043982).

87209138 is a wasteful number, since it uses less digits than its factorization.

87209138 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23153.

The product of its (nonzero) digits is 24192, while the sum is 38.

The square root of 87209138 is about 9338.5832972673. The cubic root of 87209138 is about 443.4595356817.

The spelling of 87209138 in words is "eighty-seven million, two hundred nine thousand, one hundred thirty-eight".