87197972 has 24 divisors (see below), whose sum is σ = 156473856. Its totient is φ = 42498848.

The previous prime is 87197969. The next prime is 87198029. The reversal of 87197972 is 27979178.

It is a self number, because there is not a number n which added to its sum of digits gives 87197972.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 54293 + ... + 55875.

It is an arithmetic number, because the mean of its divisors is an integer number (6519744).

Almost surely, 2^87197972 is an apocalyptic number.

It is an amenable number.

87197972 is a deficient number, since it is larger than the sum of its proper divisors (69275884).

87197972 is a wasteful number, since it uses less digits than its factorization.

87197972 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1927 (or 1925 counting only the distinct ones).

The product of its digits is 444528, while the sum is 50.

The square root of 87197972 is about 9337.9854358421. The cubic root of 87197972 is about 443.4406084582.

The spelling of 87197972 in words is "eighty-seven million, one hundred ninety-seven thousand, nine hundred seventy-two".