646602736 has 40 divisors (see below), whose sum is σ = 1359069264. Its totient is φ = 296240640.

The previous prime is 646602731. The next prime is 646602757. The reversal of 646602736 is 637206646.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (646602731) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 17151 + ... + 39841.

Almost surely, 2^646602736 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 646602736, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (679534632).

646602736 is an abundant number, since it is smaller than the sum of its proper divisors (712466528).

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

646602736 is a wasteful number, since it uses less digits than its factorization.

646602736 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22849 (or 22843 counting only the distinct ones).

The product of its (nonzero) digits is 217728, while the sum is 40.

The square root of 646602736 is about 25428.3844551714. The cubic root of 646602736 is about 864.7273182390.

The spelling of 646602736 in words is "six hundred forty-six million, six hundred two thousand, seven hundred thirty-six".