320427891 has 48 divisors (see below), whose sum is σ = 539675136. Its totient is φ = 179434368.

The previous prime is 320427869. The next prime is 320427901. The reversal of 320427891 is 198724023.

It is not a de Polignac number, because 320427891 - 2⁵ = 320427859 is a prime.

It is not an unprimeable number, because it can be changed into a prime (320427841) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 1218226 + ... + 1218488.

It is an arithmetic number, because the mean of its divisors is an integer number (11243232).

Almost surely, 2^320427891 is an apocalyptic number.

320427891 is a deficient number, since it is larger than the sum of its proper divisors (219247245).

320427891 is a wasteful number, since it uses less digits than its factorization.

320427891 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 592 (or 589 counting only the distinct ones).

The product of its (nonzero) digits is 24192, while the sum is 36.

The square root of 320427891 is about 17900.4997416273. The cubic root of 320427891 is about 684.2951109349.

The spelling of 320427891 in words is "three hundred twenty million, four hundred twenty-seven thousand, eight hundred ninety-one".