87664431 has 8 divisors (see below), whose sum is σ = 121968000. Its totient is φ = 55901912.

The previous prime is 87664399. The next prime is 87664439. The reversal of 87664431 is 13446678.

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 87664431 - 2⁵ = 87664399 is a prime.

It is a super-2 number, since 2×87664431² = 15370104925107522, which contains 22 as substring.

It is a nialpdrome in base 10.

It is a self number, because there is not a number n which added to its sum of digits gives 87664431.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (87664439) 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, 635181 + ... + 635318.

It is an arithmetic number, because the mean of its divisors is an integer number (15246000).

Almost surely, 2^87664431 is an apocalyptic number.

87664431 is a deficient number, since it is larger than the sum of its proper divisors (34303569).

87664431 is a wasteful number, since it uses less digits than its factorization.

87664431 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1270525.

The product of its digits is 96768, while the sum is 39.

The square root of 87664431 is about 9362.9285482695. The cubic root of 87664431 is about 444.2299200789.

The spelling of 87664431 in words is "eighty-seven million, six hundred sixty-four thousand, four hundred thirty-one".