645596250 has 320 divisors, whose sum is σ = 1983864960. Its totient is φ = 138240000.

The previous prime is 645596249. The next prime is 645596261. The reversal of 645596250 is 52695546.

It is an unprimeable number.

It is a polite number, since it can be written in 159 ways as a sum of consecutive naturals, for example, 15746230 + ... + 15746270.

It is an arithmetic number, because the mean of its divisors is an integer number (6199578).

Almost surely, 2^645596250 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 645596250, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (991932480).

645596250 is an abundant number, since it is smaller than the sum of its proper divisors (1338268710).

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

645596250 is a wasteful number, since it uses less digits than its factorization.

645596250 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 115 (or 100 counting only the distinct ones).

The product of its (nonzero) digits is 324000, while the sum is 42.

The square root of 645596250 is about 25408.5861472062. The cubic root of 645596250 is about 864.2784141112.

The spelling of 645596250 in words is "six hundred forty-five million, five hundred ninety-six thousand, two hundred fifty".