64019913 has 4 divisors (see below), whose sum is σ = 85359888. Its totient is φ = 42679940.

The previous prime is 64019869. The next prime is 64019933. The reversal of 64019913 is 31991046.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 64019913 - 2⁹ = 64019401 is a prime.

It is not an unprimeable number, because it can be changed into a prime (64019933) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 10669983 + ... + 10669988.

It is an arithmetic number, because the mean of its divisors is an integer number (21339972).

Almost surely, 2^64019913 is an apocalyptic number.

It is an amenable number.

64019913 is a deficient number, since it is larger than the sum of its proper divisors (21339975).

64019913 is a wasteful number, since it uses less digits than its factorization.

64019913 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21339974.

The product of its (nonzero) digits is 5832, while the sum is 33.

The square root of 64019913 is about 8001.2444657066. The cubic root of 64019913 is about 400.0414811148.

The spelling of 64019913 in words is "sixty-four million, nineteen thousand, nine hundred thirteen".