649172894 has 16 divisors (see below), whose sum is σ = 979292160. Its totient is φ = 322747320.

The previous prime is 649172857. The next prime is 649172903. The reversal of 649172894 is 498271946.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 440579 + ... + 442049.

It is an arithmetic number, because the mean of its divisors is an integer number (61205760).

Almost surely, 2^649172894 is an apocalyptic number.

649172894 is a deficient number, since it is larger than the sum of its proper divisors (330119266).

649172894 is a wasteful number, since it uses less digits than its factorization.

649172894 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2575.

The product of its digits is 870912, while the sum is 50.

The square root of 649172894 is about 25478.8715213213. The cubic root of 649172894 is about 865.8715280728.

The spelling of 649172894 in words is "six hundred forty-nine million, one hundred seventy-two thousand, eight hundred ninety-four".