64866728 has 8 divisors (see below), whose sum is σ = 121625130. Its totient is φ = 32433360.

The previous prime is 64866719. The next prime is 64866733. The reversal of 64866728 is 82766846.

It can be written as a sum of positive squares in only one way, i.e., 59567524 + 5299204 = 7718^2 + 2302^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4054163 + ... + 4054178.

Almost surely, 2^64866728 is an apocalyptic number.

It is an amenable number.

64866728 is a deficient number, since it is larger than the sum of its proper divisors (56758402).

64866728 is a wasteful number, since it uses less digits than its factorization.

64866728 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8108347 (or 8108343 counting only the distinct ones).

The product of its digits is 774144, while the sum is 47.

The square root of 64866728 is about 8053.9883287723. The cubic root of 64866728 is about 401.7975928816.

It can be divided in two parts, 648 and 66728, that added together give a palindrome (67376).

The spelling of 64866728 in words is "sixty-four million, eight hundred sixty-six thousand, seven hundred twenty-eight".