646625000 has 112 divisors (see below), whose sum is σ = 1734352800. Its totient is φ = 221400000.

The previous prime is 646624999. The next prime is 646625003. The reversal of 646625000 is 526646.

646625000 is digitally balanced in base 2 and base 6, because in such bases it contains all the possibile digits an equal number of times.

It is a sliding number, since 646625000 = 256000000 + 390625000 and 1/256000000 + 1/390625000 = 0.00000000646625000.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (646625003) by changing a digit.

It is a polite number, since it can be written in 27 ways as a sum of consecutive naturals, for example, 874631 + ... + 875369.

Almost surely, 2^646625000 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 646625000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (867176400).

646625000 is an abundant number, since it is smaller than the sum of its proper divisors (1087727800).

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

646625000 is an frugal number, since it uses more digits than its factorization.

646625000 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 782 (or 753 counting only the distinct ones).

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

The square root of 646625000 is about 25428.8222299028. The cubic root of 646625000 is about 864.7372429666.

The spelling of 646625000 in words is "six hundred forty-six million, six hundred twenty-five thousand".