64364257 has 4 divisors (see below), whose sum is σ = 64380820. Its totient is φ = 64347696.

The previous prime is 64364243. The next prime is 64364263. The reversal of 64364257 is 75246346.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 40246336 + 24117921 = 6344^2 + 4911^2 .

It is a cyclic number.

It is not a de Polignac number, because 64364257 - 2⁷ = 64364129 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (64364297) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1063 + ... + 11395.

It is an arithmetic number, because the mean of its divisors is an integer number (16095205).

Almost surely, 2^64364257 is an apocalyptic number.

It is an amenable number.

64364257 is a deficient number, since it is larger than the sum of its proper divisors (16563).

64364257 is a wasteful number, since it uses less digits than its factorization.

64364257 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16562.

The product of its digits is 120960, while the sum is 37.

The square root of 64364257 is about 8022.7337610069. The cubic root of 64364257 is about 400.7574335806.

The spelling of 64364257 in words is "sixty-four million, three hundred sixty-four thousand, two hundred fifty-seven".