849640872 has 32 divisors (see below), whose sum is σ = 2125893600. Its totient is φ = 282974784.

The previous prime is 849640867. The next prime is 849640877. The reversal of 849640872 is 278046948.

849640872 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an interprime number because it is at equal distance from previous prime (849640867) and next prime (849640877).

It is a super-2 number, since 2×849640872² = 1443779222745840768, which contains 22 as substring.

It is a Smith number, since the sum of its digits (48) coincides with the sum of the digits of its prime factors.

It is not an unprimeable number, because it can be changed into a prime (849640877) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 15379 + ... + 43997.

It is an arithmetic number, because the mean of its divisors is an integer number (66434175).

Almost surely, 2^849640872 is an apocalyptic number.

It is an amenable number.

849640872 is an abundant number, since it is smaller than the sum of its proper divisors (1276252728).

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

849640872 is a wasteful number, since it uses less digits than its factorization.

849640872 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 29865 (or 29861 counting only the distinct ones).

The product of its (nonzero) digits is 774144, while the sum is 48.

The square root of 849640872 is about 29148.5998291513. The cubic root of 849640872 is about 947.1348103352.

The spelling of 849640872 in words is "eight hundred forty-nine million, six hundred forty thousand, eight hundred seventy-two".