64749564 has 48 divisors (see below), whose sum is σ = 183133440. Its totient is φ = 19620720.

The previous prime is 64749563. The next prime is 64749569. The reversal of 64749564 is 46594746.

64749564 is a `hidden beast` number, since 6 + 47 + 49 + 564 = 666.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (64749563) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 26064 + ... + 28439.

It is an arithmetic number, because the mean of its divisors is an integer number (3815280).

Almost surely, 2^64749564 is an apocalyptic number.

It is an amenable number.

64749564 is an abundant number, since it is smaller than the sum of its proper divisors (118383876).

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

64749564 is a wasteful number, since it uses less digits than its factorization.

64749564 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 54527 (or 54519 counting only the distinct ones).

The product of its digits is 725760, while the sum is 45.

The square root of 64749564 is about 8046.7113779481. The cubic root of 64749564 is about 401.5555346054. Note that the first 4 decimals are identical.

The spelling of 64749564 in words is "sixty-four million, seven hundred forty-nine thousand, five hundred sixty-four".