645485670 has 48 divisors (see below), whose sum is σ = 1766597040. Its totient is φ = 163069632.

The previous prime is 645485629. The next prime is 645485677. The reversal of 645485670 is 76584546.

645485670 is a `hidden beast` number, since 6 + 45 + 48 + 567 + 0 = 666.

645485670 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (645485677) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 187029 + ... + 190448.

It is an arithmetic number, because the mean of its divisors is an integer number (36804105).

Almost surely, 2^645485670 is an apocalyptic number.

645485670 is an abundant number, since it is smaller than the sum of its proper divisors (1121111370).

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

645485670 is a wasteful number, since it uses less digits than its factorization.

645485670 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 377509 (or 377506 counting only the distinct ones).

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

The square root of 645485670 is about 25406.4100179463. The cubic root of 645485670 is about 864.2290657431.

The spelling of 645485670 in words is "six hundred forty-five million, four hundred eighty-five thousand, six hundred seventy".