646040745 has 96 divisors (see below), whose sum is σ = 1348300800. Its totient is φ = 292626432.

The previous prime is 646040723. The next prime is 646040761. The reversal of 646040745 is 547040646.

646040745 is a `hidden beast` number, since 6 + 4 + 604 + 0 + 7 + 45 = 666.

It is not a de Polignac number, because 646040745 - 2²¹ = 643943593 is a prime.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 839721 + ... + 840489.

It is an arithmetic number, because the mean of its divisors is an integer number (14044800).

Almost surely, 2^646040745 is an apocalyptic number.

It is an amenable number.

646040745 is an abundant number, since it is smaller than the sum of its proper divisors (702260055).

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

646040745 is a wasteful number, since it uses less digits than its factorization.

646040745 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 924 (or 911 counting only the distinct ones).

The product of its (nonzero) digits is 80640, while the sum is 36.

The square root of 646040745 is about 25417.3315869310. The cubic root of 646040745 is about 864.4767213869.

Subtracting from 646040745 its reverse (547040646), we obtain a palindrome (99000099).

The spelling of 646040745 in words is "six hundred forty-six million, forty thousand, seven hundred forty-five".