645857622 has 48 divisors (see below), whose sum is σ = 1435145712. Its totient is φ = 209848320.

The previous prime is 645857617. The next prime is 645857657. The reversal of 645857622 is 226758546.

645857622 is a `hidden beast` number, since 6 + 4 + 58 + 576 + 22 = 666.

645857622 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 114222 + ... + 119742.

It is an arithmetic number, because the mean of its divisors is an integer number (29898869).

Almost surely, 2^645857622 is an apocalyptic number.

645857622 is an abundant number, since it is smaller than the sum of its proper divisors (789288090).

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

645857622 is a wasteful number, since it uses less digits than its factorization.

645857622 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5693 (or 5690 counting only the distinct ones).

The product of its digits is 806400, while the sum is 45.

The square root of 645857622 is about 25413.7290061888. The cubic root of 645857622 is about 864.3950337989.

The spelling of 645857622 in words is "six hundred forty-five million, eight hundred fifty-seven thousand, six hundred twenty-two".