64326431690 has 8 divisors (see below), whose sum is σ = 115787577060. Its totient is φ = 25730572672.

The previous prime is 64326431683. The next prime is 64326431737. The reversal of 64326431690 is 9613462346.

It can be written as a sum of positive squares in 2 ways, for example, as 60058814761 + 4267616929 = 245069^2 + 65327^2 .

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

It is a super-2 number, since 2×64326431690² (a number of 22 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3216321575 + ... + 3216321594.

Almost surely, 2^64326431690 is an apocalyptic number.

64326431690 is a deficient number, since it is larger than the sum of its proper divisors (51461145370).

64326431690 is a wasteful number, since it uses less digits than its factorization.

64326431690 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6432643176.

The product of its (nonzero) digits is 559872, while the sum is 44.

The spelling of 64326431690 in words is "sixty-four billion, three hundred twenty-six million, four hundred thirty-one thousand, six hundred ninety".