64797728 has 18 divisors (see below), whose sum is σ = 127660239. Its totient is φ = 32376096.

The previous prime is 64797721. The next prime is 64797731. The reversal of 64797728 is 82779746.

It is a powerful number, because all its prime factors have an exponent greater than 1 and also an Achilles number because it is not a perfect power.

64797728 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in only one way, i.e., 32398864 + 32398864 = 5692^2 + 5692^2 .

It is an ABA number since it can be written as A⋅B^A, here for A=2, B=5692.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (64797721) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 44825 + ... + 46247.

Almost surely, 2^64797728 is an apocalyptic number.

It is an amenable number.

64797728 is a deficient number, since it is larger than the sum of its proper divisors (62862511).

64797728 is an frugal number, since it uses more digits than its factorization.

64797728 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2856 (or 1425 counting only the distinct ones).

The product of its digits is 1185408, while the sum is 50.

The square root of 64797728 is about 8049.7035970277. The cubic root of 64797728 is about 401.6550756992.

Multiplying 64797728 by its sum of digits (50), we get a square (3239886400 = 56920²).

The spelling of 64797728 in words is "sixty-four million, seven hundred ninety-seven thousand, seven hundred twenty-eight".