64989715 has 16 divisors (see below), whose sum is σ = 91304640. Its totient is φ = 43476480.

The previous prime is 64989707. The next prime is 64989719. The reversal of 64989715 is 51798946.

It is not a de Polignac number, because 64989715 - 2³ = 64989707 is a prime.

It is not an unprimeable number, because it can be changed into a prime (64989719) 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, 21210 + ... + 24079.

It is an arithmetic number, because the mean of its divisors is an integer number (5706540).

Almost surely, 2^64989715 is an apocalyptic number.

64989715 is a deficient number, since it is larger than the sum of its proper divisors (26314925).

64989715 is a wasteful number, since it uses less digits than its factorization.

64989715 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 45342.

The product of its digits is 544320, while the sum is 49.

The square root of 64989715 is about 8061.6198744421. The cubic root of 64989715 is about 402.0513679893.

The spelling of 64989715 in words is "sixty-four million, nine hundred eighty-nine thousand, seven hundred fifteen".