64216915 has 16 divisors (see below), whose sum is σ = 88768512. Its totient is φ = 43684704.

The previous prime is 64216913. The next prime is 64216921. The reversal of 64216915 is 51961246.

It is not a de Polignac number, because 64216915 - 2¹ = 64216913 is a prime.

It is not an unprimeable number, because it can be changed into a prime (64216913) 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, 2779 + ... + 11668.

It is an arithmetic number, because the mean of its divisors is an integer number (5548032).

Almost surely, 2^64216915 is an apocalyptic number.

64216915 is a deficient number, since it is larger than the sum of its proper divisors (24551597).

64216915 is a wasteful number, since it uses less digits than its factorization.

64216915 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14586.

The product of its digits is 12960, while the sum is 34.

The square root of 64216915 is about 8013.5457195925. The cubic root of 64216915 is about 400.4513966610.

The spelling of 64216915 in words is "sixty-four million, two hundred sixteen thousand, nine hundred fifteen".