645842292 has 12 divisors (see below), whose sum is σ = 1506965376. Its totient is φ = 215280760.

The previous prime is 645842213. The next prime is 645842293. The reversal of 645842292 is 292248546.

It is a tau number, because it is divible by the number of its divisors (12).

It is a super-2 number, since 2×645842292² = 834224532271626528, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (645842293) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 26910084 + ... + 26910107.

It is an arithmetic number, because the mean of its divisors is an integer number (125580448).

Almost surely, 2^645842292 is an apocalyptic number.

It is an amenable number.

645842292 is an abundant number, since it is smaller than the sum of its proper divisors (861123084).

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

645842292 is a wasteful number, since it uses less digits than its factorization.

645842292 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 53820198 (or 53820196 counting only the distinct ones).

The product of its digits is 276480, while the sum is 42.

The square root of 645842292 is about 25413.4273957686. The cubic root of 645842292 is about 864.3881946855.

The spelling of 645842292 in words is "six hundred forty-five million, eight hundred forty-two thousand, two hundred ninety-two".