64730812690 has 32 divisors (see below), whose sum is σ = 117346909680. Its totient is φ = 25707811584.

The previous prime is 64730812613. The next prime is 64730812697. The reversal of 64730812690 is 9621803746.

It can be written as a sum of positive squares in 8 ways, for example, as 59461359409 + 5269453281 = 243847^2 + 72591^2 .

It is a super-2 number, since 2×64730812690² (a number of 22 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 64730812690.

It is not an unprimeable number, because it can be changed into a prime (64730812697) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2140596 + ... + 2170624.

Almost surely, 2^64730812690 is an apocalyptic number.

64730812690 is a deficient number, since it is larger than the sum of its proper divisors (52616096990).

64730812690 is a wasteful number, since it uses less digits than its factorization.

64730812690 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 31566.

The product of its (nonzero) digits is 435456, while the sum is 46.

The spelling of 64730812690 in words is "sixty-four billion, seven hundred thirty million, eight hundred twelve thousand, six hundred ninety".