645170412 has 12 divisors (see below), whose sum is σ = 1505397656. Its totient is φ = 215056800.

The previous prime is 645170399. The next prime is 645170467. The reversal of 645170412 is 214071546.

It is a tau number, because it is divible by the number of its divisors (12).

It is a self number, because there is not a number n which added to its sum of digits gives 645170412.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 26882089 + ... + 26882112.

Almost surely, 2^645170412 is an apocalyptic number.

It is an amenable number.

645170412 is an abundant number, since it is smaller than the sum of its proper divisors (860227244).

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

645170412 is a wasteful number, since it uses less digits than its factorization.

645170412 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 53764208 (or 53764206 counting only the distinct ones).

The product of its (nonzero) digits is 6720, while the sum is 30.

The square root of 645170412 is about 25400.2049598030. The cubic root of 645170412 is about 864.0883450901.

The spelling of 645170412 in words is "six hundred forty-five million, one hundred seventy thousand, four hundred twelve".