64728567 has 12 divisors (see below), whose sum is σ = 93608424. Its totient is φ = 43100880.

The previous prime is 64728523. The next prime is 64728581. The reversal of 64728567 is 76582746.

64728567 is a `hidden beast` number, since 64 + 7 + 28 + 567 = 666.

It is not a de Polignac number, because 64728567 - 2⁷ = 64728439 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (64728067) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 4648 + ... + 12290.

It is an arithmetic number, because the mean of its divisors is an integer number (7800702).

Almost surely, 2^64728567 is an apocalyptic number.

64728567 is a deficient number, since it is larger than the sum of its proper divisors (28879857).

64728567 is a wasteful number, since it uses less digits than its factorization.

64728567 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8590 (or 8587 counting only the distinct ones).

The product of its digits is 564480, while the sum is 45.

The square root of 64728567 is about 8045.4065776690. The cubic root of 64728567 is about 401.5121244129.

The spelling of 64728567 in words is "sixty-four million, seven hundred twenty-eight thousand, five hundred sixty-seven".