64403992 has 8 divisors (see below), whose sum is σ = 120757500. Its totient is φ = 32201992.

The previous prime is 64403947. The next prime is 64404061. The reversal of 64403992 is 29930446.

It is a tau number, because it is divible by the number of its divisors (8).

It is a hoax number, since the sum of its digits (37) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4025242 + ... + 4025257.

Almost surely, 2^64403992 is an apocalyptic number.

It is an amenable number.

64403992 is a deficient number, since it is larger than the sum of its proper divisors (56353508).

64403992 is a wasteful number, since it uses less digits than its factorization.

64403992 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8050505 (or 8050501 counting only the distinct ones).

The product of its (nonzero) digits is 46656, while the sum is 37.

The square root of 64403992 is about 8025.2097791896. The cubic root of 64403992 is about 400.8398852476.

The spelling of 64403992 in words is "sixty-four million, four hundred three thousand, nine hundred ninety-two".