645011622 has 24 divisors (see below), whose sum is σ = 1410590376. Its totient is φ = 212993856.

The previous prime is 645011611. The next prime is 645011657. The reversal of 645011622 is 226110546.

645011622 is a `hidden beast` number, since 645 + 0 + 1 + 16 + 2 + 2 = 666.

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 in 11 ways as a sum of consecutive naturals, for example, 165523 + ... + 169374.

It is an arithmetic number, because the mean of its divisors is an integer number (58774599).

Almost surely, 2^645011622 is an apocalyptic number.

645011622 is an abundant number, since it is smaller than the sum of its proper divisors (765578754).

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

645011622 is a wasteful number, since it uses less digits than its factorization.

645011622 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 335012 (or 335009 counting only the distinct ones).

The product of its (nonzero) digits is 2880, while the sum is 27.

The square root of 645011622 is about 25397.0790052715. The cubic root of 645011622 is about 864.0174491718.

The spelling of 645011622 in words is "six hundred forty-five million, eleven thousand, six hundred twenty-two".