645294436 has 18 divisors (see below), whose sum is σ = 1143784950. Its totient is φ = 318550752.

The previous prime is 645294401. The next prime is 645294437. The reversal of 645294436 is 634492546.

It is a happy number.

645294436 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in only one way, i.e., 359481600 + 285812836 = 18960^2 + 16906^2 .

It is a junction number, because it is equal to n+sod(n) for n = 645294392 and 645294401.

It is not an unprimeable number, because it can be changed into a prime (645294437) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 12040 + ... + 37888.

Almost surely, 2^645294436 is an apocalyptic number.

It is an amenable number.

645294436 is a deficient number, since it is larger than the sum of its proper divisors (498490514).

645294436 is a wasteful number, since it uses less digits than its factorization.

645294436 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26011 (or 25930 counting only the distinct ones).

The product of its digits is 622080, while the sum is 43.

The square root of 645294436 is about 25402.6462401066. The cubic root of 645294436 is about 864.1437107343.

The spelling of 645294436 in words is "six hundred forty-five million, two hundred ninety-four thousand, four hundred thirty-six".