645772794 has 32 divisors (see below), whose sum is σ = 1351365120. Its totient is φ = 205338672.

The previous prime is 645772793. The next prime is 645772807. The reversal of 645772794 is 497277546.

It is not an unprimeable number, because it can be changed into a prime (645772793) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 46129 + ... + 58475.

It is an arithmetic number, because the mean of its divisors is an integer number (42230160).

Almost surely, 2^645772794 is an apocalyptic number.

645772794 is an abundant number, since it is smaller than the sum of its proper divisors (705592326).

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

645772794 is a wasteful number, since it uses less digits than its factorization.

645772794 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12754.

The product of its digits is 2963520, while the sum is 51.

The square root of 645772794 is about 25412.0600109476. The cubic root of 645772794 is about 864.3571884546.

The spelling of 645772794 in words is "six hundred forty-five million, seven hundred seventy-two thousand, seven hundred ninety-four".