645412892 has 6 divisors (see below), whose sum is σ = 1129472568. Its totient is φ = 322706444.

The previous prime is 645412861. The next prime is 645412903. The reversal of 645412892 is 298214546.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 80676608 + ... + 80676615.

It is an arithmetic number, because the mean of its divisors is an integer number (188245428).

Almost surely, 2^645412892 is an apocalyptic number.

It is an amenable number.

645412892 is a deficient number, since it is larger than the sum of its proper divisors (484059676).

645412892 is a wasteful number, since it uses less digits than its factorization.

645412892 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 161353227 (or 161353225 counting only the distinct ones).

The product of its digits is 138240, while the sum is 41.

The square root of 645412892 is about 25404.9777012301. The cubic root of 645412892 is about 864.1965841405.

The spelling of 645412892 in words is "six hundred forty-five million, four hundred twelve thousand, eight hundred ninety-two".