64628389 has 16 divisors (see below), whose sum is σ = 75651840. Its totient is φ = 54069120.

The previous prime is 64628383. The next prime is 64628393. The reversal of 64628389 is 98382646.

It is a happy number.

It is not a de Polignac number, because 64628389 - 2¹⁵ = 64595621 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (64628383) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 53577 + ... + 54769.

It is an arithmetic number, because the mean of its divisors is an integer number (4728240).

Almost surely, 2^64628389 is an apocalyptic number.

It is an amenable number.

64628389 is a deficient number, since it is larger than the sum of its proper divisors (11023451).

64628389 is a wasteful number, since it uses less digits than its factorization.

64628389 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1380.

The product of its digits is 497664, while the sum is 46.

The square root of 64628389 is about 8039.1783784165. The cubic root of 64628389 is about 401.3048823264.

The spelling of 64628389 in words is "sixty-four million, six hundred twenty-eight thousand, three hundred eighty-nine".