64331813 has 8 divisors (see below), whose sum is σ = 79177728. Its totient is φ = 50899824.

The previous prime is 64331809. The next prime is 64331819. The reversal of 64331813 is 31813346.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 64331813 - 2² = 64331809 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (64331819) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 353381 + ... + 353562.

It is an arithmetic number, because the mean of its divisors is an integer number (9897216).

Almost surely, 2^64331813 is an apocalyptic number.

It is an amenable number.

64331813 is a deficient number, since it is larger than the sum of its proper divisors (14845915).

64331813 is a wasteful number, since it uses less digits than its factorization.

64331813 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 706963.

The product of its digits is 5184, while the sum is 29.

The square root of 64331813 is about 8020.7115021050. The cubic root of 64331813 is about 400.6900858525.

The spelling of 64331813 in words is "sixty-four million, three hundred thirty-one thousand, eight hundred thirteen".