645918700 has 36 divisors (see below), whose sum is σ = 1601880112. Its totient is φ = 221457600.

The previous prime is 645918677. The next prime is 645918701. The reversal of 645918700 is 7819546.

It is not an unprimeable number, because it can be changed into a prime (645918701) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 460671 + ... + 462070.

Almost surely, 2^645918700 is an apocalyptic number.

It is an amenable number.

645918700 is an abundant number, since it is smaller than the sum of its proper divisors (955961412).

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

645918700 is a wasteful number, since it uses less digits than its factorization.

645918700 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 922762 (or 922755 counting only the distinct ones).

The product of its (nonzero) digits is 60480, while the sum is 40.

The square root of 645918700 is about 25414.9306510956. The cubic root of 645918700 is about 864.4222812159.

The spelling of 645918700 in words is "six hundred forty-five million, nine hundred eighteen thousand, seven hundred".