6445990374 has 36 divisors (see below), whose sum is σ = 13100178636. Its totient is φ = 2114509824.

The previous prime is 6445990303. The next prime is 6445990391. The reversal of 6445990374 is 4730995446.

It is a happy number.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 14356102 + ... + 14356550.

It is an arithmetic number, because the mean of its divisors is an integer number (363893851).

Almost surely, 2^6445990374 is an apocalyptic number.

6445990374 is an abundant number, since it is smaller than the sum of its proper divisors (6654188262).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

6445990374 is an frugal number, since it uses more digits than its factorization.

6445990374 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1049 (or 527 counting only the distinct ones).

The product of its (nonzero) digits is 3265920, while the sum is 51.

The square root of 6445990374 is about 80286.9252992042. The cubic root of 6445990374 is about 1861.0721815767.

The spelling of 6445990374 in words is "six billion, four hundred forty-five million, nine hundred ninety thousand, three hundred seventy-four".