845431820 has 24 divisors (see below), whose sum is σ = 1776112800. Its totient is φ = 338038272.

The previous prime is 845431813. The next prime is 845431831. The reversal of 845431820 is 28134548.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 54716 + ... + 68444.

It is an arithmetic number, because the mean of its divisors is an integer number (74004700).

Almost surely, 2^845431820 is an apocalyptic number.

It is an amenable number.

845431820 is an abundant number, since it is smaller than the sum of its proper divisors (930680980).

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

845431820 is a wasteful number, since it uses less digits than its factorization.

845431820 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16817 (or 16815 counting only the distinct ones).

The product of its (nonzero) digits is 30720, while the sum is 35.

The square root of 845431820 is about 29076.3102886181. The cubic root of 845431820 is about 945.5682108557.

The spelling of 845431820 in words is "eight hundred forty-five million, four hundred thirty-one thousand, eight hundred twenty".