64684992 has 28 divisors (see below), whose sum is σ = 171146216. Its totient is φ = 21561600.

The previous prime is 64684981. The next prime is 64684999. The reversal of 64684992 is 29948646.

It is a Harshad number since it is a multiple of its sum of digits (48).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (64684999) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 168259 + ... + 168642.

Almost surely, 2^64684992 is an apocalyptic number.

It is an amenable number.

64684992 is an abundant number, since it is smaller than the sum of its proper divisors (106461224).

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

64684992 is a wasteful number, since it uses less digits than its factorization.

64684992 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 336916 (or 336906 counting only the distinct ones).

The product of its digits is 746496, while the sum is 48.

The square root of 64684992 is about 8042.6980547575. The cubic root of 64684992 is about 401.4220054276.

The spelling of 64684992 in words is "sixty-four million, six hundred eighty-four thousand, nine hundred ninety-two".