64428239 has 4 divisors (see below), whose sum is σ = 64445424. Its totient is φ = 64411056.

The previous prime is 64428229. The next prime is 64428241. The reversal of 64428239 is 93282446.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 64428239 - 2⁸ = 64427983 is a prime.

It is a super-2 number, since 2×64428239² = 8301995961282242, 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 (64428229) 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, 302 + ... + 11355.

It is an arithmetic number, because the mean of its divisors is an integer number (16111356).

Almost surely, 2^64428239 is an apocalyptic number.

64428239 is a deficient number, since it is larger than the sum of its proper divisors (17185).

64428239 is a wasteful number, since it uses less digits than its factorization.

64428239 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17184.

The product of its digits is 82944, while the sum is 38.

The square root of 64428239 is about 8026.7203140511. The cubic root of 64428239 is about 400.8901820535.

The spelling of 64428239 in words is "sixty-four million, four hundred twenty-eight thousand, two hundred thirty-nine".