64491315 has 32 divisors (see below), whose sum is σ = 121737216. Its totient is φ = 28529280.

The previous prime is 64491311. The next prime is 64491337. The reversal of 64491315 is 51319446.

It is not a de Polignac number, because 64491315 - 2² = 64491311 is a prime.

It is not an unprimeable number, because it can be changed into a prime (64491311) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 6652 + ... + 13161.

It is an arithmetic number, because the mean of its divisors is an integer number (3804288).

Almost surely, 2^64491315 is an apocalyptic number.

64491315 is a deficient number, since it is larger than the sum of its proper divisors (57245901).

64491315 is a wasteful number, since it uses less digits than its factorization.

64491315 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19859.

The product of its digits is 12960, while the sum is 33.

The square root of 64491315 is about 8030.6484794193. The cubic root of 64491315 is about 401.0209647768.

The spelling of 64491315 in words is "sixty-four million, four hundred ninety-one thousand, three hundred fifteen".