87312147 has 24 divisors (see below), whose sum is σ = 127941744. Its totient is φ = 52650624.

The previous prime is 87312139. The next prime is 87312157. The reversal of 87312147 is 74121378.

It is a happy number.

It is not a de Polignac number, because 87312147 - 2³ = 87312139 is a prime.

It is a super-2 number, since 2×87312147² = 15246822027499218, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (87312157) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 109153 + ... + 109949.

It is an arithmetic number, because the mean of its divisors is an integer number (5330906).

Almost surely, 2^87312147 is an apocalyptic number.

87312147 is a deficient number, since it is larger than the sum of its proper divisors (40629597).

87312147 is a wasteful number, since it uses less digits than its factorization.

87312147 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 919 (or 866 counting only the distinct ones).

The product of its digits is 9408, while the sum is 33.

The square root of 87312147 is about 9344.0969066037. The cubic root of 87312147 is about 443.6340676581.

It can be divided in two parts, 8731 and 2147, that added together give a triangular number (10878 = T₁₄₇).

The spelling of 87312147 in words is "eighty-seven million, three hundred twelve thousand, one hundred forty-seven".