64845731 has 2 divisors, whose sum is σ = 64845732. Its totient is φ = 64845730.

The previous prime is 64845721. The next prime is 64845773. The reversal of 64845731 is 13754846.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 64845731 - 2¹⁰ = 64844707 is a prime.

It is a super-2 number, since 2×64845731² = 8409937657848722, which contains 22 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (64845721) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32422865 + 32422866.

It is an arithmetic number, because the mean of its divisors is an integer number (32422866).

Almost surely, 2^64845731 is an apocalyptic number.

64845731 is a deficient number, since it is larger than the sum of its proper divisors (1).

64845731 is an equidigital number, since it uses as much as digits as its factorization.

64845731 is an evil number, because the sum of its binary digits is even.

The product of its digits is 80640, while the sum is 38.

The square root of 64845731 is about 8052.6847075991. The cubic root of 64845731 is about 401.7542349857.

The spelling of 64845731 in words is "sixty-four million, eight hundred forty-five thousand, seven hundred thirty-one".