64777992 has 32 divisors (see below), whose sum is σ = 170469600. Its totient is φ = 20456064.

The previous prime is 64777987. The next prime is 64777997. The reversal of 64777992 is 29977746.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (64777987) and next prime (64777997).

It is not an unprimeable number, because it can be changed into a prime (64777997) 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, 70573 + ... + 71484.

It is an arithmetic number, because the mean of its divisors is an integer number (5327175).

Almost surely, 2^64777992 is an apocalyptic number.

It is an amenable number.

64777992 is an abundant number, since it is smaller than the sum of its proper divisors (105691608).

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

64777992 is a wasteful number, since it uses less digits than its factorization.

64777992 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 142085 (or 142081 counting only the distinct ones).

The product of its digits is 1333584, while the sum is 51.

The square root of 64777992 is about 8048.4776200223. The cubic root of 64777992 is about 401.6142930475.

The spelling of 64777992 in words is "sixty-four million, seven hundred seventy-seven thousand, nine hundred ninety-two".