87997986 has 24 divisors (see below), whose sum is σ = 191144460. Its totient is φ = 29258496.

The previous prime is 87997939. The next prime is 87997991. The reversal of 87997986 is 68979978.

It can be written as a sum of positive squares in 2 ways, for example, as 69205761 + 18792225 = 8319^2 + 4335^2 .

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1386 + ... + 13338.

Almost surely, 2^87997986 is an apocalyptic number.

87997986 is an abundant number, since it is smaller than the sum of its proper divisors (103146474).

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

87997986 is a wasteful number, since it uses less digits than its factorization.

87997986 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12370 (or 12367 counting only the distinct ones).

The product of its digits is 13716864, while the sum is 63.

The square root of 87997986 is about 9380.7241724720. The cubic root of 87997986 is about 444.7926248335.

The spelling of 87997986 in words is "eighty-seven million, nine hundred ninety-seven thousand, nine hundred eighty-six".