646875900 has 324 divisors, whose sum is σ = 2347365384. Its totient is φ = 147744000.

The previous prime is 646875871. The next prime is 646875913. The reversal of 646875900 is 9578646.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 107 ways as a sum of consecutive naturals, for example, 3573810 + ... + 3573990.

Almost surely, 2^646875900 is an apocalyptic number.

646875900 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 646875900, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1173682692).

646875900 is an abundant number, since it is smaller than the sum of its proper divisors (1700489484).

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

646875900 is a wasteful number, since it uses less digits than its factorization.

646875900 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 250 (or 221 counting only the distinct ones).

The product of its (nonzero) digits is 362880, while the sum is 45.

The square root of 646875900 is about 25433.7551297483. The cubic root of 646875900 is about 864.8490720890.

The spelling of 646875900 in words is "six hundred forty-six million, eight hundred seventy-five thousand, nine hundred".