64980813 has 4 divisors (see below), whose sum is σ = 86641088. Its totient is φ = 43320540.

The previous prime is 64980803. The next prime is 64980823. The reversal of 64980813 is 31808946.

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 an interprime number because it is at equal distance from previous prime (64980803) and next prime (64980823).

It is not a de Polignac number, because 64980813 - 2⁵ = 64980781 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (64980803) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 10830133 + ... + 10830138.

It is an arithmetic number, because the mean of its divisors is an integer number (21660272).

Almost surely, 2^64980813 is an apocalyptic number.

It is an amenable number.

64980813 is a deficient number, since it is larger than the sum of its proper divisors (21660275).

64980813 is a wasteful number, since it uses less digits than its factorization.

64980813 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21660274.

The product of its (nonzero) digits is 41472, while the sum is 39.

The square root of 64980813 is about 8061.0677332473. The cubic root of 64980813 is about 402.0330100860.

The spelling of 64980813 in words is "sixty-four million, nine hundred eighty thousand, eight hundred thirteen".