64320987 has 8 divisors (see below), whose sum is σ = 85800960. Its totient is φ = 42860840.

The previous prime is 64320983. The next prime is 64320989. The reversal of 64320987 is 78902346.

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 64320987 - 2² = 64320983 is a prime.

It is not an unprimeable number, because it can be changed into a prime (64320983) 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, 6214 + ... + 12932.

It is an arithmetic number, because the mean of its divisors is an integer number (10725120).

Almost surely, 2^64320987 is an apocalyptic number.

64320987 is a deficient number, since it is larger than the sum of its proper divisors (21479973).

64320987 is a wasteful number, since it uses less digits than its factorization.

64320987 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9913.

The product of its (nonzero) digits is 72576, while the sum is 39.

The square root of 64320987 is about 8020.0365959265. The cubic root of 64320987 is about 400.6676080455.

The spelling of 64320987 in words is "sixty-four million, three hundred twenty thousand, nine hundred eighty-seven".