646400744 has 16 divisors (see below), whose sum is σ = 1322183520. Its totient is φ = 293818480.

The previous prime is 646400737. The next prime is 646400753. The reversal of 646400744 is 447004646.

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, 3672644 + ... + 3672819.

It is an arithmetic number, because the mean of its divisors is an integer number (82636470).

Almost surely, 2^646400744 is an apocalyptic number.

It is an amenable number.

646400744 is an abundant number, since it is smaller than the sum of its proper divisors (675782776).

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

646400744 is a wasteful number, since it uses less digits than its factorization.

646400744 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7345480 (or 7345476 counting only the distinct ones).

The product of its (nonzero) digits is 64512, while the sum is 35.

The square root of 646400744 is about 25424.4123629239. The cubic root of 646400744 is about 864.6372649074.

The spelling of 646400744 in words is "six hundred forty-six million, four hundred thousand, seven hundred forty-four".