64456239 has 4 divisors (see below), whose sum is σ = 85941656. Its totient is φ = 42970824.

The previous prime is 64456237. The next prime is 64456243. The reversal of 64456239 is 93265446.

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

It is not a de Polignac number, because 64456239 - 2¹ = 64456237 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 64456197 and 64456206.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (64456237) 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, 10742704 + ... + 10742709.

It is an arithmetic number, because the mean of its divisors is an integer number (21485414).

Almost surely, 2^64456239 is an apocalyptic number.

64456239 is a deficient number, since it is larger than the sum of its proper divisors (21485417).

64456239 is a wasteful number, since it uses less digits than its factorization.

64456239 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21485416.

The product of its digits is 155520, while the sum is 39.

The square root of 64456239 is about 8028.4642989802. The cubic root of 64456239 is about 400.9482482037.

The spelling of 64456239 in words is "sixty-four million, four hundred fifty-six thousand, two hundred thirty-nine".