645658250 has 32 divisors (see below), whose sum is σ = 1211056704. Its totient is φ = 257754000.

The previous prime is 645658229. The next prime is 645658253. The reversal of 645658250 is 52856546.

It is a junction number, because it is equal to n+sod(n) for n = 645658198 and 645658207.

It is not an unprimeable number, because it can be changed into a prime (645658253) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 140489 + ... + 145011.

It is an arithmetic number, because the mean of its divisors is an integer number (37845522).

Almost surely, 2^645658250 is an apocalyptic number.

645658250 is a deficient number, since it is larger than the sum of its proper divisors (565398454).

645658250 is a wasteful number, since it uses less digits than its factorization.

645658250 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5111 (or 5101 counting only the distinct ones).

The product of its (nonzero) digits is 288000, while the sum is 41.

The square root of 645658250 is about 25409.8061779306. The cubic root of 645658250 is about 864.3060802913.

The spelling of 645658250 in words is "six hundred forty-five million, six hundred fifty-eight thousand, two hundred fifty".