64884728 has 8 divisors (see below), whose sum is σ = 121658880. Its totient is φ = 32442360.

The previous prime is 64884727. The next prime is 64884731. The reversal of 64884728 is 82748846.

It is a happy number.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (64884727) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4055288 + ... + 4055303.

It is an arithmetic number, because the mean of its divisors is an integer number (15207360).

Almost surely, 2^64884728 is an apocalyptic number.

It is an amenable number.

64884728 is a deficient number, since it is larger than the sum of its proper divisors (56774152).

64884728 is a wasteful number, since it uses less digits than its factorization.

64884728 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8110597 (or 8110593 counting only the distinct ones).

The product of its digits is 688128, while the sum is 47.

The square root of 64884728 is about 8055.1057100450. The cubic root of 64884728 is about 401.8347546543.

The spelling of 64884728 in words is "sixty-four million, eight hundred eighty-four thousand, seven hundred twenty-eight".