840645045 has 24 divisors (see below), whose sum is σ = 1457983800. Its totient is φ = 448077696.

The previous prime is 840645023. The next prime is 840645049. The reversal of 840645045 is 540546048.

840645045 is a `hidden beast` number, since 8 + 4 + 0 + 645 + 0 + 4 + 5 = 666.

It can be written as a sum of positive squares in 4 ways, for example, as 196196049 + 644448996 = 14007^2 + 25386^2 .

It is not a de Polignac number, because 840645045 - 2⁸ = 840644789 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (840645049) 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, 88591 + ... + 97619.

It is an arithmetic number, because the mean of its divisors is an integer number (60749325).

Almost surely, 2^840645045 is an apocalyptic number.

It is an amenable number.

840645045 is a deficient number, since it is larger than the sum of its proper divisors (617338755).

840645045 is a wasteful number, since it uses less digits than its factorization.

840645045 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11109 (or 11106 counting only the distinct ones).

The product of its (nonzero) digits is 76800, while the sum is 36.

The square root of 840645045 is about 28993.8794403233. The cubic root of 840645045 is about 943.7802521186.

The spelling of 840645045 in words is "eight hundred forty million, six hundred forty-five thousand, forty-five".