87139827 has 16 divisors (see below), whose sum is σ = 129296160. Its totient is φ = 58003200.

The previous prime is 87139823. The next prime is 87139831. The reversal of 87139827 is 72893178.

It is an interprime number because it is at equal distance from previous prime (87139823) and next prime (87139831).

It is not a de Polignac number, because 87139827 - 2² = 87139823 is a prime.

It is not an unprimeable number, because it can be changed into a prime (87139823) 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, 18427 + ... + 22667.

It is an arithmetic number, because the mean of its divisors is an integer number (8081010).

Almost surely, 2^87139827 is an apocalyptic number.

87139827 is a deficient number, since it is larger than the sum of its proper divisors (42156333).

87139827 is a wasteful number, since it uses less digits than its factorization.

87139827 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5011 (or 5005 counting only the distinct ones).

The product of its digits is 169344, while the sum is 45.

The square root of 87139827 is about 9334.8715577666. The cubic root of 87139827 is about 443.3420221160.

The spelling of 87139827 in words is "eighty-seven million, one hundred thirty-nine thousand, eight hundred twenty-seven".