645350000 has 60 divisors (see below), whose sum is σ = 1562978088. Its totient is φ = 258120000.

The previous prime is 645349987. The next prime is 645350047. The reversal of 645350000 is 53546.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 43547 + ... + 56453.

Almost surely, 2^645350000 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 645350000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (781489044).

645350000 is an abundant number, since it is smaller than the sum of its proper divisors (917628088).

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

645350000 is an equidigital number, since it uses as much as digits as its factorization.

645350000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12940 (or 12914 counting only the distinct ones).

The product of its (nonzero) digits is 1800, while the sum is 23.

The square root of 645350000 is about 25403.7398821512. The cubic root of 645350000 is about 864.1685127991.

The spelling of 645350000 in words is "six hundred forty-five million, three hundred fifty thousand".