64266257 has 4 divisors (see below), whose sum is σ = 70108656. Its totient is φ = 58423860.

The previous prime is 64266221. The next prime is 64266259. The reversal of 64266257 is 75266246.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 64266257 - 2²² = 60071953 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 64266257.

It is not an unprimeable number, because it can be changed into a prime (64266259) 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, 2921183 + ... + 2921204.

It is an arithmetic number, because the mean of its divisors is an integer number (17527164).

Almost surely, 2^64266257 is an apocalyptic number.

It is an amenable number.

64266257 is a deficient number, since it is larger than the sum of its proper divisors (5842399).

64266257 is a wasteful number, since it uses less digits than its factorization.

64266257 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5842398.

The product of its digits is 120960, while the sum is 38.

The square root of 64266257 is about 8016.6237905991. The cubic root of 64266257 is about 400.5539346203.

The spelling of 64266257 in words is "sixty-four million, two hundred sixty-six thousand, two hundred fifty-seven".