87631972 has 12 divisors (see below), whose sum is σ = 153490876. Its totient is φ = 43777440.

The previous prime is 87631969. The next prime is 87631993. The reversal of 87631972 is 27913678.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 33108516 + 54523456 = 5754^2 + 7384^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4179 + ... + 13882.

Almost surely, 2^87631972 is an apocalyptic number.

It is an amenable number.

87631972 is a deficient number, since it is larger than the sum of its proper divisors (65858904).

87631972 is a wasteful number, since it uses less digits than its factorization.

87631972 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19278 (or 19276 counting only the distinct ones).

The product of its digits is 127008, while the sum is 43.

The square root of 87631972 is about 9361.1950091855. The cubic root of 87631972 is about 444.1750858326.

The spelling of 87631972 in words is "eighty-seven million, six hundred thirty-one thousand, nine hundred seventy-two".