64412731 has 4 divisors (see below), whose sum is σ = 65188872. Its totient is φ = 63636592.

The previous prime is 64412723. The next prime is 64412737. The reversal of 64412731 is 13721446.

64412731 = 3274² + 3275² + ... + 3279².

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 64412731 - 2³ = 64412723 is a prime.

It is a super-2 number, since 2×64412731² = 8297999829756722, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 64412731.

It is not an unprimeable number, because it can be changed into a prime (64412737) 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, 387946 + ... + 388111.

It is an arithmetic number, because the mean of its divisors is an integer number (16297218).

Almost surely, 2^64412731 is an apocalyptic number.

64412731 is a deficient number, since it is larger than the sum of its proper divisors (776141).

64412731 is an equidigital number, since it uses as much as digits as its factorization.

64412731 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 776140.

The product of its digits is 4032, while the sum is 28.

The square root of 64412731 is about 8025.7542324694. The cubic root of 64412731 is about 400.8580144620.

The spelling of 64412731 in words is "sixty-four million, four hundred twelve thousand, seven hundred thirty-one".