64457457 has 4 divisors (see below), whose sum is σ = 85943280. Its totient is φ = 42971636.

The previous prime is 64457429. The next prime is 64457483. The reversal of 64457457 is 75475446.

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 a cyclic number.

It is not a de Polignac number, because 64457457 - 2¹⁰ = 64456433 is a prime.

It is not an unprimeable number, because it can be changed into a prime (64457957) 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, 10742907 + ... + 10742912.

It is an arithmetic number, because the mean of its divisors is an integer number (21485820).

Almost surely, 2^64457457 is an apocalyptic number.

It is an amenable number.

64457457 is a deficient number, since it is larger than the sum of its proper divisors (21485823).

64457457 is a wasteful number, since it uses less digits than its factorization.

64457457 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21485822.

The product of its digits is 470400, while the sum is 42.

The square root of 64457457 is about 8028.5401537266. The cubic root of 64457457 is about 400.9507736995.

The spelling of 64457457 in words is "sixty-four million, four hundred fifty-seven thousand, four hundred fifty-seven".