64634815 has 16 divisors (see below), whose sum is σ = 88796160. Its totient is φ = 44244000.

The previous prime is 64634809. The next prime is 64634831. The reversal of 64634815 is 51843646.

It is a happy number.

It is not a de Polignac number, because 64634815 - 2¹¹ = 64632767 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 25056 + ... + 27514.

It is an arithmetic number, because the mean of its divisors is an integer number (5549760).

Almost surely, 2^64634815 is an apocalyptic number.

64634815 is a deficient number, since it is larger than the sum of its proper divisors (24161345).

64634815 is a wasteful number, since it uses less digits than its factorization.

64634815 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3222.

The product of its digits is 69120, while the sum is 37.

The square root of 64634815 is about 8039.5780361907. The cubic root of 64634815 is about 401.3181824656.

The spelling of 64634815 in words is "sixty-four million, six hundred thirty-four thousand, eight hundred fifteen".