64723239 has 16 divisors (see below), whose sum is σ = 109584640. Its totient is φ = 36984600.

The previous prime is 64723237. The next prime is 64723261. The reversal of 64723239 is 93232746.

It is a happy number.

64723239 is a `hidden beast` number, since 647 + 2 + 3 + 2 + 3 + 9 = 666.

It is not a de Polignac number, because 64723239 - 2¹ = 64723237 is a prime.

It is a super-2 number, since 2×64723239² = 8378195333302242, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (64723237) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 171037 + ... + 171414.

It is an arithmetic number, because the mean of its divisors is an integer number (6849040).

Almost surely, 2^64723239 is an apocalyptic number.

64723239 is a deficient number, since it is larger than the sum of its proper divisors (44861401).

64723239 is a wasteful number, since it uses less digits than its factorization.

64723239 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 342467 (or 342461 counting only the distinct ones).

The product of its digits is 54432, while the sum is 36.

The square root of 64723239 is about 8045.0754502366. The cubic root of 64723239 is about 401.5011075601.

The spelling of 64723239 in words is "sixty-four million, seven hundred twenty-three thousand, two hundred thirty-nine".