645164140 has 24 divisors (see below), whose sum is σ = 1357371792. Its totient is φ = 257584320.

The previous prime is 645164137. The next prime is 645164147. The reversal of 645164140 is 41461546.

645164140 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not an unprimeable number, because it can be changed into a prime (645164147) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 18994 + ... + 40633.

It is an arithmetic number, because the mean of its divisors is an integer number (56557158).

Almost surely, 2^645164140 is an apocalyptic number.

It is an amenable number.

645164140 is an abundant number, since it is smaller than the sum of its proper divisors (712207652).

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

645164140 is a wasteful number, since it uses less digits than its factorization.

645164140 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 60177 (or 60175 counting only the distinct ones).

The product of its (nonzero) digits is 11520, while the sum is 31.

The square root of 645164140 is about 25400.0814959323. The cubic root of 645164140 is about 864.0855450135.

The spelling of 645164140 in words is "six hundred forty-five million, one hundred sixty-four thousand, one hundred forty".