64239515 has 8 divisors (see below), whose sum is σ = 81622080. Its totient is φ = 48368512.

The previous prime is 64239509. The next prime is 64239517. The reversal of 64239515 is 51593246.

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

It is a cyclic number.

It is not a de Polignac number, because 64239515 - 2¹⁸ = 63977371 is a prime.

It is not an unprimeable number, because it can be changed into a prime (64239517) 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, 377795 + ... + 377964.

It is an arithmetic number, because the mean of its divisors is an integer number (10202760).

Almost surely, 2^64239515 is an apocalyptic number.

64239515 is a deficient number, since it is larger than the sum of its proper divisors (17382565).

64239515 is a wasteful number, since it uses less digits than its factorization.

64239515 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 755781.

The product of its digits is 32400, while the sum is 35.

The square root of 64239515 is about 8014.9557079250. The cubic root of 64239515 is about 400.4983683978.

The spelling of 64239515 in words is "sixty-four million, two hundred thirty-nine thousand, five hundred fifteen".