645195632 has 20 divisors (see below), whose sum is σ = 1304418000. Its totient is φ = 308571648.

The previous prime is 645195601. The next prime is 645195641. The reversal of 645195632 is 236591546.

It is a self number, because there is not a number n which added to its sum of digits gives 645195632.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 876257 + ... + 876992.

It is an arithmetic number, because the mean of its divisors is an integer number (65220900).

Almost surely, 2^645195632 is an apocalyptic number.

It is an amenable number.

645195632 is an abundant number, since it is smaller than the sum of its proper divisors (659222368).

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

645195632 is a wasteful number, since it uses less digits than its factorization.

645195632 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1753280 (or 1753274 counting only the distinct ones).

The product of its digits is 194400, while the sum is 41.

The square root of 645195632 is about 25400.7014076383. The cubic root of 645195632 is about 864.0996041434.

The spelling of 645195632 in words is "six hundred forty-five million, one hundred ninety-five thousand, six hundred thirty-two".