64372257 has 12 divisors (see below), whose sum is σ = 96188820. Its totient is φ = 41434848.

The previous prime is 64372241. The next prime is 64372261. The reversal of 64372257 is 75227346.

It is a happy number.

64372257 is a `hidden beast` number, since 643 + 7 + 2 + 2 + 5 + 7 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 50466816 + 13905441 = 7104^2 + 3729^2 .

It is not a de Polignac number, because 64372257 - 2⁴ = 64372241 is a prime.

It is not an unprimeable number, because it can be changed into a prime (64372757) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 123058 + ... + 123579.

It is an arithmetic number, because the mean of its divisors is an integer number (8015735).

Almost surely, 2^64372257 is an apocalyptic number.

It is an amenable number.

64372257 is a deficient number, since it is larger than the sum of its proper divisors (31816563).

64372257 is a wasteful number, since it uses less digits than its factorization.

64372257 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 246672 (or 246669 counting only the distinct ones).

The product of its digits is 70560, while the sum is 36.

The square root of 64372257 is about 8023.2323286815. The cubic root of 64372257 is about 400.7740366188.

It can be divided in two parts, 643 and 72257, that added together give a square (72900 = 270²).

The spelling of 64372257 in words is "sixty-four million, three hundred seventy-two thousand, two hundred fifty-seven".