87838915 has 32 divisors (see below), whose sum is σ = 115015680. Its totient is φ = 64157184.

The previous prime is 87838897. The next prime is 87838921. The reversal of 87838915 is 51983878.

It is not a de Polignac number, because 87838915 - 2¹³ = 87830723 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 691582 + ... + 691708.

It is an arithmetic number, because the mean of its divisors is an integer number (3594240).

Almost surely, 2^87838915 is an apocalyptic number.

87838915 is a gapful number since it is divisible by the number (85) formed by its first and last digit.

87838915 is a deficient number, since it is larger than the sum of its proper divisors (27176765).

87838915 is a wasteful number, since it uses less digits than its factorization.

87838915 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 331.

The product of its digits is 483840, while the sum is 49.

The square root of 87838915 is about 9372.2417275698. The cubic root of 87838915 is about 444.5244509556.

It can be divided in two parts, 878 and 38915, that added together give a palindrome (39793).

The spelling of 87838915 in words is "eighty-seven million, eight hundred thirty-eight thousand, nine hundred fifteen".