64731313 has 4 divisors (see below), whose sum is σ = 65697520. Its totient is φ = 63765108.

The previous prime is 64731311. The next prime is 64731341. The reversal of 64731313 is 31313746.

It is a happy number.

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, and also an emirpimes, since its reverse is a distinct semiprime: 31313746 = 2 ⋅15656873.

It is a cyclic number.

It is not a de Polignac number, because 64731313 - 2¹ = 64731311 is a prime.

It is not an unprimeable number, because it can be changed into a prime (64731311) 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, 483003 + ... + 483136.

It is an arithmetic number, because the mean of its divisors is an integer number (16424380).

Almost surely, 2^64731313 is an apocalyptic number.

It is an amenable number.

64731313 is a deficient number, since it is larger than the sum of its proper divisors (966207).

64731313 is an equidigital number, since it uses as much as digits as its factorization.

64731313 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 966206.

The product of its digits is 4536, while the sum is 28.

The square root of 64731313 is about 8045.5772322438. The cubic root of 64731313 is about 401.5178021570.

The spelling of 64731313 in words is "sixty-four million, seven hundred thirty-one thousand, three hundred thirteen".