645302922 has 48 divisors (see below), whose sum is σ = 1435825440. Its totient is φ = 193172320.

The previous prime is 645302921. The next prime is 645302941. The reversal of 645302922 is 229203546.

It is a super-2 number, since 2×645302922² = 832831722283476168, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (33).

It is not an unprimeable number, because it can be changed into a prime (645302921) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 54904 + ... + 65612.

It is an arithmetic number, because the mean of its divisors is an integer number (29913030).

Almost surely, 2^645302922 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 645302922, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (717912720).

645302922 is an abundant number, since it is smaller than the sum of its proper divisors (790522518).

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

645302922 is a wasteful number, since it uses less digits than its factorization.

645302922 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10819 (or 10808 counting only the distinct ones).

The product of its (nonzero) digits is 25920, while the sum is 33.

The square root of 645302922 is about 25402.8132693999. The cubic root of 645302922 is about 864.1474987165.

The spelling of 645302922 in words is "six hundred forty-five million, three hundred two thousand, nine hundred twenty-two".