87816972 has 24 divisors (see below), whose sum is σ = 208773936. Its totient is φ = 28719808.

The previous prime is 87816941. The next prime is 87816973. The reversal of 87816972 is 27961878.

It is not an unprimeable number, because it can be changed into a prime (87816973) 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, 68403 + ... + 69674.

It is an arithmetic number, because the mean of its divisors is an integer number (8698914).

Almost surely, 2^87816972 is an apocalyptic number.

It is an amenable number.

87816972 is an abundant number, since it is smaller than the sum of its proper divisors (120956964).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

87816972 is a wasteful number, since it uses less digits than its factorization.

87816972 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 138137 (or 138135 counting only the distinct ones).

The product of its digits is 338688, while the sum is 48.

The square root of 87816972 is about 9371.0710166981. The cubic root of 87816972 is about 444.4874323882.

It can be divided in two parts, 87816 and 972, that added together give a palindrome (88788).

The spelling of 87816972 in words is "eighty-seven million, eight hundred sixteen thousand, nine hundred seventy-two".