645228192 has 192 divisors, whose sum is σ = 2027047680. Its totient is φ = 175816704.

The previous prime is 645228179. The next prime is 645228197. The reversal of 645228192 is 291822546.

It is a self number, because there is not a number n which added to its sum of digits gives 645228192.

It is not an unprimeable number, because it can be changed into a prime (645228197) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 2201998 + ... + 2202290.

It is an arithmetic number, because the mean of its divisors is an integer number (10557540).

Almost surely, 2^645228192 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 645228192, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1013523840).

645228192 is an abundant number, since it is smaller than the sum of its proper divisors (1381819488).

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

645228192 is a wasteful number, since it uses less digits than its factorization.

645228192 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 455 (or 447 counting only the distinct ones).

The product of its digits is 69120, while the sum is 39.

The square root of 645228192 is about 25401.3423267354. The cubic root of 645228192 is about 864.1141395847.

The spelling of 645228192 in words is "six hundred forty-five million, two hundred twenty-eight thousand, one hundred ninety-two".