847121640 has 64 divisors (see below), whose sum is σ = 2583048960. Its totient is φ = 222193920.

The previous prime is 847121621. The next prime is 847121641. The reversal of 847121640 is 46121748.

847121640 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not an unprimeable number, because it can be changed into a prime (847121641) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 50544 + ... + 65183.

It is an arithmetic number, because the mean of its divisors is an integer number (40360140).

Almost surely, 2^847121640 is an apocalyptic number.

It is an amenable number.

847121640 is an abundant number, since it is smaller than the sum of its proper divisors (1735927320).

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

847121640 is a wasteful number, since it uses less digits than its factorization.

847121640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 115802 (or 115798 counting only the distinct ones).

The product of its (nonzero) digits is 10752, while the sum is 33.

The square root of 847121640 is about 29105.3541466171. The cubic root of 847121640 is about 946.1977813102.

The spelling of 847121640 in words is "eight hundred forty-seven million, one hundred twenty-one thousand, six hundred forty".