64249615 has 4 divisors (see below), whose sum is σ = 77099544. Its totient is φ = 51399688.

The previous prime is 64249609. The next prime is 64249663. The reversal of 64249615 is 51694246.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-64249615 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6424957 + ... + 6424966.

It is an arithmetic number, because the mean of its divisors is an integer number (19274886).

Almost surely, 2^64249615 is an apocalyptic number.

64249615 is a deficient number, since it is larger than the sum of its proper divisors (12849929).

64249615 is a wasteful number, since it uses less digits than its factorization.

64249615 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12849928.

The product of its digits is 51840, while the sum is 37.

The square root of 64249615 is about 8015.5857552646. The cubic root of 64249615 is about 400.5193566299.

The spelling of 64249615 in words is "sixty-four million, two hundred forty-nine thousand, six hundred fifteen".