87142172 has 24 divisors (see below), whose sum is σ = 164494176. Its totient is φ = 40154688.

The previous prime is 87142171. The next prime is 87142177. The reversal of 87142172 is 27124178.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (87142171) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 49418 + ... + 51150.

It is an arithmetic number, because the mean of its divisors is an integer number (6853924).

Almost surely, 2^87142172 is an apocalyptic number.

It is an amenable number.

87142172 is a deficient number, since it is larger than the sum of its proper divisors (77352004).

87142172 is a wasteful number, since it uses less digits than its factorization.

87142172 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2717 (or 2715 counting only the distinct ones).

The product of its digits is 6272, while the sum is 32.

The square root of 87142172 is about 9334.9971612208. The cubic root of 87142172 is about 443.3459989723.

The spelling of 87142172 in words is "eighty-seven million, one hundred forty-two thousand, one hundred seventy-two".