645436192 has 48 divisors (see below), whose sum is σ = 1319848992. Its totient is φ = 310464000.

The previous prime is 645436171. The next prime is 645436193. The reversal of 645436192 is 291634546.

It is not an unprimeable number, because it can be changed into a prime (645436193) 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, 88692 + ... + 95692.

It is an arithmetic number, because the mean of its divisors is an integer number (27496854).

Almost surely, 2^645436192 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 645436192, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (659924496).

645436192 is an abundant number, since it is smaller than the sum of its proper divisors (674412800).

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

645436192 is a wasteful number, since it uses less digits than its factorization.

645436192 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7121 (or 7113 counting only the distinct ones).

The product of its digits is 155520, while the sum is 40.

The square root of 645436192 is about 25405.4362686414. The cubic root of 645436192 is about 864.2069834463.

The spelling of 645436192 in words is "six hundred forty-five million, four hundred thirty-six thousand, one hundred ninety-two".