87397631 has 4 divisors (see below), whose sum is σ = 91197552. Its totient is φ = 83597712.

The previous prime is 87397591. The next prime is 87397633. The reversal of 87397631 is 13679378.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 13679378 = 2 ⋅6839689.

It is a cyclic number.

It is not a de Polignac number, because 87397631 - 2²⁶ = 20288767 is a prime.

It is a super-2 number, since 2×87397631² = 15276691808824322, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (87397633) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1899926 + ... + 1899971.

It is an arithmetic number, because the mean of its divisors is an integer number (22799388).

Almost surely, 2^87397631 is an apocalyptic number.

87397631 is a deficient number, since it is larger than the sum of its proper divisors (3799921).

87397631 is a wasteful number, since it uses less digits than its factorization.

87397631 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3799920.

The product of its digits is 190512, while the sum is 44.

The square root of 87397631 is about 9348.6700123600. The cubic root of 87397631 is about 443.7788021773.

The spelling of 87397631 in words is "eighty-seven million, three hundred ninety-seven thousand, six hundred thirty-one".