645422426 has 16 divisors (see below), whose sum is σ = 1057190400. Its totient is φ = 293083680.

The previous prime is 645422423. The next prime is 645422431. The reversal of 645422426 is 624224546.

It is not an unprimeable number, because it can be changed into a prime (645422423) 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, 9095 + ... + 37061.

It is an arithmetic number, because the mean of its divisors is an integer number (66074400).

Almost surely, 2^645422426 is an apocalyptic number.

645422426 is a deficient number, since it is larger than the sum of its proper divisors (411767974).

645422426 is a wasteful number, since it uses less digits than its factorization.

645422426 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 29029.

The product of its digits is 92160, while the sum is 35.

The square root of 645422426 is about 25405.1653409302. The cubic root of 645422426 is about 864.2008394061.

The spelling of 645422426 in words is "six hundred forty-five million, four hundred twenty-two thousand, four hundred twenty-six".