645170448 has 40 divisors (see below), whose sum is σ = 1794899008. Its totient is φ = 198513792.

The previous prime is 645170399. The next prime is 645170467. The reversal of 645170448 is 844071546.

It is a Harshad number since it is a multiple of its sum of digits (39).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 516340 + ... + 517587.

Almost surely, 2^645170448 is an apocalyptic number.

It is an amenable number.

645170448 is an abundant number, since it is smaller than the sum of its proper divisors (1149728560).

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

645170448 is a wasteful number, since it uses less digits than its factorization.

645170448 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1033951 (or 1033945 counting only the distinct ones).

The product of its (nonzero) digits is 107520, while the sum is 39.

The square root of 645170448 is about 25400.2056684587. The cubic root of 645170448 is about 864.0883611619.

The spelling of 645170448 in words is "six hundred forty-five million, one hundred seventy thousand, four hundred forty-eight".