646260500 has 96 divisors (see below), whose sum is σ = 1465140768. Its totient is φ = 248832000.

The previous prime is 646260499. The next prime is 646260551. The reversal of 646260500 is 5062646.

It can be written as a sum of positive squares in 16 ways, for example, as 580520836 + 65739664 = 24094^2 + 8108^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 3348404 + ... + 3348596.

It is an arithmetic number, because the mean of its divisors is an integer number (15261883).

Almost surely, 2^646260500 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 646260500, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (732570384).

646260500 is an abundant number, since it is smaller than the sum of its proper divisors (818880268).

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

646260500 is a wasteful number, since it uses less digits than its factorization.

646260500 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 430 (or 418 counting only the distinct ones).

The product of its (nonzero) digits is 8640, while the sum is 29.

The square root of 646260500 is about 25421.6541554636. The cubic root of 646260500 is about 864.5747294187.

The spelling of 646260500 in words is "six hundred forty-six million, two hundred sixty thousand, five hundred".