64731725 has 6 divisors (see below), whose sum is σ = 80267370. Its totient is φ = 51785360.

The previous prime is 64731707. The next prime is 64731739. The reversal of 64731725 is 52713746.

It can be written as a sum of positive squares in 3 ways, for example, as 2920681 + 61811044 = 1709^2 + 7862^2 .

It is not a de Polignac number, because 64731725 - 2¹⁴ = 64715341 is a prime.

It is a congruent number.

It is an unprimeable number.

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 in 5 ways as a sum of consecutive naturals, for example, 1294610 + ... + 1294659.

It is an arithmetic number, because the mean of its divisors is an integer number (13377895).

Almost surely, 2^64731725 is an apocalyptic number.

It is an amenable number.

64731725 is a deficient number, since it is larger than the sum of its proper divisors (15535645).

64731725 is a wasteful number, since it uses less digits than its factorization.

64731725 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2589279 (or 2589274 counting only the distinct ones).

The product of its digits is 35280, while the sum is 35.

The square root of 64731725 is about 8045.6028363324. The cubic root of 64731725 is about 401.5186540115.

It can be divided in two parts, 64731 and 725, that added together give a palindrome (65456).

The spelling of 64731725 in words is "sixty-four million, seven hundred thirty-one thousand, seven hundred twenty-five".