64704813 has 4 divisors (see below), whose sum is σ = 86273088. Its totient is φ = 43136540.

The previous prime is 64704811. The next prime is 64704821. The reversal of 64704813 is 31840746.

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 64704813 - 2¹ = 64704811 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (64704811) 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, 10784133 + ... + 10784138.

It is an arithmetic number, because the mean of its divisors is an integer number (21568272).

Almost surely, 2^64704813 is an apocalyptic number.

It is an amenable number.

64704813 is a deficient number, since it is larger than the sum of its proper divisors (21568275).

64704813 is a wasteful number, since it uses less digits than its factorization.

64704813 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21568274.

The product of its (nonzero) digits is 16128, while the sum is 33.

The square root of 64704813 is about 8043.9301961168. The cubic root of 64704813 is about 401.4630029489.

The spelling of 64704813 in words is "sixty-four million, seven hundred four thousand, eight hundred thirteen".