64389725 has 6 divisors (see below), whose sum is σ = 79843290. Its totient is φ = 51511760.

The previous prime is 64389713. The next prime is 64389739. The reversal of 64389725 is 52798346.

It can be written as a sum of positive squares in 3 ways, for example, as 9821956 + 54567769 = 3134^2 + 7387^2 .

It is a de Polignac number, because none of the positive numbers 2^k-64389725 is a prime.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1287770 + ... + 1287819.

It is an arithmetic number, because the mean of its divisors is an integer number (13307215).

Almost surely, 2^64389725 is an apocalyptic number.

It is an amenable number.

64389725 is a deficient number, since it is larger than the sum of its proper divisors (15453565).

64389725 is a wasteful number, since it uses less digits than its factorization.

64389725 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2575599 (or 2575594 counting only the distinct ones).

The product of its digits is 362880, while the sum is 44.

The square root of 64389725 is about 8024.3208435356. The cubic root of 64389725 is about 400.8102845723.

The spelling of 64389725 in words is "sixty-four million, three hundred eighty-nine thousand, seven hundred twenty-five".