87138398 has 32 divisors (see below), whose sum is σ = 140555520. Its totient is φ = 40423680.

The previous prime is 87138377. The next prime is 87138431. The reversal of 87138398 is 89383178.

Its product of digits (290304) is a multiple of the sum of its prime divisors (512).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 263093 + ... + 263423.

It is an arithmetic number, because the mean of its divisors is an integer number (4392360).

Almost surely, 2^87138398 is an apocalyptic number.

87138398 is a deficient number, since it is larger than the sum of its proper divisors (53417122).

87138398 is a wasteful number, since it uses less digits than its factorization.

87138398 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 512.

The product of its digits is 290304, while the sum is 47.

The square root of 87138398 is about 9334.7950164961. The cubic root of 87138398 is about 443.3395986577.

The spelling of 87138398 in words is "eighty-seven million, one hundred thirty-eight thousand, three hundred ninety-eight".