64808615 has 4 divisors (see below), whose sum is σ = 77770344. Its totient is φ = 51846888.

The previous prime is 64808599. The next prime is 64808617. The reversal of 64808615 is 51680846.

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

It is a cyclic number.

It is not a de Polignac number, because 64808615 - 2⁴ = 64808599 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (64808617) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6480857 + ... + 6480866.

It is an arithmetic number, because the mean of its divisors is an integer number (19442586).

Almost surely, 2^64808615 is an apocalyptic number.

64808615 is a deficient number, since it is larger than the sum of its proper divisors (12961729).

64808615 is a wasteful number, since it uses less digits than its factorization.

64808615 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12961728.

The product of its (nonzero) digits is 46080, while the sum is 38.

The square root of 64808615 is about 8050.3798047049. The cubic root of 64808615 is about 401.6775691521.

The spelling of 64808615 in words is "sixty-four million, eight hundred eight thousand, six hundred fifteen".