64913019 has 4 divisors (see below), whose sum is σ = 86550696. Its totient is φ = 43275344.

The previous prime is 64912999. The next prime is 64913033. The reversal of 64913019 is 91031946.

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 64913019 - 2⁷ = 64912891 is a prime.

It is a super-2 number, since 2×64913019² = 8427400071388722, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (64913119) 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, 10818834 + ... + 10818839.

It is an arithmetic number, because the mean of its divisors is an integer number (21637674).

Almost surely, 2^64913019 is an apocalyptic number.

64913019 is a deficient number, since it is larger than the sum of its proper divisors (21637677).

64913019 is a wasteful number, since it uses less digits than its factorization.

64913019 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21637676.

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

The square root of 64913019 is about 8056.8616098330. The cubic root of 64913019 is about 401.8931487506.

The spelling of 64913019 in words is "sixty-four million, nine hundred thirteen thousand, nineteen".