64568139 has 8 divisors (see below), whose sum is σ = 86132880. Its totient is φ = 43024416.

The previous prime is 64568113. The next prime is 64568143. The reversal of 64568139 is 93186546.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 64568139 - 2⁸ = 64567883 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 64568139.

It is not an unprimeable number, because it can be changed into a prime (64568149) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4509 + ... + 12225.

It is an arithmetic number, because the mean of its divisors is an integer number (10766610).

Almost surely, 2^64568139 is an apocalyptic number.

64568139 is a deficient number, since it is larger than the sum of its proper divisors (21564741).

64568139 is a wasteful number, since it uses less digits than its factorization.

64568139 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10509.

The product of its digits is 155520, while the sum is 42.

The square root of 64568139 is about 8035.4302311700. The cubic root of 64568139 is about 401.1801376801.

The spelling of 64568139 in words is "sixty-four million, five hundred sixty-eight thousand, one hundred thirty-nine".