64403988 has 48 divisors (see below), whose sum is σ = 169236480. Its totient is φ = 18885600.

The previous prime is 64403947. The next prime is 64404061. The reversal of 64403988 is 88930446.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3778 + ... + 11961.

It is an arithmetic number, because the mean of its divisors is an integer number (3525760).

Almost surely, 2^64403988 is an apocalyptic number.

It is an amenable number.

64403988 is an abundant number, since it is smaller than the sum of its proper divisors (104832492).

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

64403988 is a wasteful number, since it uses less digits than its factorization.

64403988 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15788 (or 15786 counting only the distinct ones).

The product of its (nonzero) digits is 165888, while the sum is 42.

The square root of 64403988 is about 8025.2095299749. The cubic root of 64403988 is about 400.8398769492.

The spelling of 64403988 in words is "sixty-four million, four hundred three thousand, nine hundred eighty-eight".