645695692 has 12 divisors (see below), whose sum is σ = 1131978456. Its totient is φ = 322273280.

The previous prime is 645695689. The next prime is 645695693. The reversal of 645695692 is 296596546.

It is not an unprimeable number, because it can be changed into a prime (645695693) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 141109 + ... + 145612.

It is an arithmetic number, because the mean of its divisors is an integer number (94331538).

Almost surely, 2^645695692 is an apocalyptic number.

It is an amenable number.

645695692 is a deficient number, since it is larger than the sum of its proper divisors (486282764).

645695692 is a wasteful number, since it uses less digits than its factorization.

645695692 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 287288 (or 287286 counting only the distinct ones).

The product of its digits is 3499200, while the sum is 52.

The square root of 645695692 is about 25410.5429300517. The cubic root of 645695692 is about 864.3227871290.

The spelling of 645695692 in words is "six hundred forty-five million, six hundred ninety-five thousand, six hundred ninety-two".