64142725 has 6 divisors (see below), whose sum is σ = 79537010. Its totient is φ = 51314160.

The previous prime is 64142723. The next prime is 64142753. The reversal of 64142725 is 52724146.

It can be written as a sum of positive squares in 3 ways, for example, as 13205956 + 50936769 = 3634^2 + 7137^2 .

It is not a de Polignac number, because 64142725 - 2¹ = 64142723 is a prime.

It is a super-2 number, since 2×64142725² = 8228578340851250, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (64142723) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1282830 + ... + 1282879.

Almost surely, 2^64142725 is an apocalyptic number.

It is an amenable number.

64142725 is a deficient number, since it is larger than the sum of its proper divisors (15394285).

64142725 is a wasteful number, since it uses less digits than its factorization.

64142725 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2565719 (or 2565714 counting only the distinct ones).

The product of its digits is 13440, while the sum is 31.

The square root of 64142725 is about 8008.9153447892. The cubic root of 64142725 is about 400.2971229902.

The spelling of 64142725 in words is "sixty-four million, one hundred forty-two thousand, seven hundred twenty-five".