64657768 has 16 divisors (see below), whose sum is σ = 138552480. Its totient is φ = 27710448.

The previous prime is 64657763. The next prime is 64657771. The reversal of 64657768 is 86775646.

It is not an unprimeable number, because it can be changed into a prime (64657763) 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, 577246 + ... + 577357.

It is an arithmetic number, because the mean of its divisors is an integer number (8659530).

Almost surely, 2^64657768 is an apocalyptic number.

It is an amenable number.

64657768 is an abundant number, since it is smaller than the sum of its proper divisors (73894712).

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

64657768 is a wasteful number, since it uses less digits than its factorization.

64657768 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1154616 (or 1154612 counting only the distinct ones).

The product of its digits is 1693440, while the sum is 49.

The square root of 64657768 is about 8041.0054097731. The cubic root of 64657768 is about 401.3656819754.

The spelling of 64657768 in words is "sixty-four million, six hundred fifty-seven thousand, seven hundred sixty-eight".