64739913 has 16 divisors (see below), whose sum is σ = 99158400. Its totient is φ = 36804096.

The previous prime is 64739881. The next prime is 64739921. The reversal of 64739913 is 31993746.

It is not a de Polignac number, because 64739913 - 2⁵ = 64739881 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (64739923) 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, 3688 + ... + 11961.

It is an arithmetic number, because the mean of its divisors is an integer number (6197400).

Almost surely, 2^64739913 is an apocalyptic number.

It is an amenable number.

64739913 is a deficient number, since it is larger than the sum of its proper divisors (34418487).

64739913 is a wasteful number, since it uses less digits than its factorization.

64739913 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15856.

The product of its digits is 122472, while the sum is 42.

The square root of 64739913 is about 8046.1116696203. Note that the first 3 decimals coincide. The cubic root of 64739913 is about 401.5355828365.

The spelling of 64739913 in words is "sixty-four million, seven hundred thirty-nine thousand, nine hundred thirteen".