645170974 has 16 divisors (see below), whose sum is σ = 1129540608. Its totient is φ = 270618552.

The previous prime is 645170971. The next prime is 645170983. The reversal of 645170974 is 479071546.

645170974 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a self number, because there is not a number n which added to its sum of digits gives 645170974.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (645170971) 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, 489594 + ... + 490909.

It is an arithmetic number, because the mean of its divisors is an integer number (70596288).

Almost surely, 2^645170974 is an apocalyptic number.

645170974 is a deficient number, since it is larger than the sum of its proper divisors (484369634).

645170974 is a wasteful number, since it uses less digits than its factorization.

645170974 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 980559.

The product of its (nonzero) digits is 211680, while the sum is 43.

The square root of 645170974 is about 25400.2160227034. The cubic root of 645170974 is about 864.0885959889.

The spelling of 645170974 in words is "six hundred forty-five million, one hundred seventy thousand, nine hundred seventy-four".