87709631 has 8 divisors (see below), whose sum is σ = 88816224. Its totient is φ = 86607360.

The previous prime is 87709627. The next prime is 87709639. The reversal of 87709631 is 13690778.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 87709631 - 2² = 87709627 is a prime.

It is a super-2 number, since 2×87709631² = 15385958740312322, 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 (87709639) 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, 60491 + ... + 61923.

It is an arithmetic number, because the mean of its divisors is an integer number (11102028).

Almost surely, 2^87709631 is an apocalyptic number.

87709631 is a deficient number, since it is larger than the sum of its proper divisors (1106593).

87709631 is a wasteful number, since it uses less digits than its factorization.

87709631 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2161.

The product of its (nonzero) digits is 63504, while the sum is 41.

The square root of 87709631 is about 9365.3420119075. The cubic root of 87709631 is about 444.3062556469.

The spelling of 87709631 in words is "eighty-seven million, seven hundred nine thousand, six hundred thirty-one".