64145728 has 28 divisors (see below), whose sum is σ = 127682752. Its totient is φ = 31973760.

The previous prime is 64145717. The next prime is 64145747. The reversal of 64145728 is 82754146.

It is a super-2 number, since 2×64145728² = 8229348841299968, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 22123 + ... + 24853.

Almost surely, 2^64145728 is an apocalyptic number.

It is an amenable number.

64145728 is a deficient number, since it is larger than the sum of its proper divisors (63537024).

64145728 is a wasteful number, since it uses less digits than its factorization.

64145728 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3110 (or 3100 counting only the distinct ones).

The product of its digits is 53760, while the sum is 37.

The square root of 64145728 is about 8009.1028211654. The cubic root of 64145728 is about 400.3033698587.

The spelling of 64145728 in words is "sixty-four million, one hundred forty-five thousand, seven hundred twenty-eight".