87421915 has 16 divisors (see below), whose sum is σ = 120219840. Its totient is φ = 59783040.

The previous prime is 87421909. The next prime is 87421931. The reversal of 87421915 is 51912478.

It is not a de Polignac number, because 87421915 - 2⁵ = 87421883 is a prime.

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, 10405 + ... + 16825.

It is an arithmetic number, because the mean of its divisors is an integer number (7513740).

Almost surely, 2^87421915 is an apocalyptic number.

87421915 is a deficient number, since it is larger than the sum of its proper divisors (32797925).

87421915 is a wasteful number, since it uses less digits than its factorization.

87421915 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6822.

The product of its digits is 20160, while the sum is 37.

The square root of 87421915 is about 9349.9687165252. The cubic root of 87421915 is about 443.8199006462.

The spelling of 87421915 in words is "eighty-seven million, four hundred twenty-one thousand, nine hundred fifteen".