64328815 has 16 divisors (see below), whose sum is σ = 83332800. Its totient is φ = 47525632.

The previous prime is 64328791. The next prime is 64328843. The reversal of 64328815 is 51882346.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 64328815 - 2¹⁷ = 64197743 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, 6310 + ... + 12979.

It is an arithmetic number, because the mean of its divisors is an integer number (5208300).

Almost surely, 2^64328815 is an apocalyptic number.

64328815 is a deficient number, since it is larger than the sum of its proper divisors (19003985).

64328815 is a wasteful number, since it uses less digits than its factorization.

64328815 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19346.

The product of its digits is 46080, while the sum is 37.

The square root of 64328815 is about 8020.5246087772. The cubic root of 64328815 is about 400.6838614176.

The spelling of 64328815 in words is "sixty-four million, three hundred twenty-eight thousand, eight hundred fifteen".