320428432840 has 64 divisors (see below), whose sum is σ = 759032467200. Its totient is φ = 121405828608.

The previous prime is 320428432823. The next prime is 320428432861. The reversal of 320428432840 is 48234824023.

It is a Harshad number since it is a multiple of its sum of digits (40).

It is a junction number, because it is equal to n+sod(n) for n = 320428432793 and 320428432802.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 5180577 + ... + 5242063.

It is an arithmetic number, because the mean of its divisors is an integer number (11859882300).

Almost surely, 2^320428432840 is an apocalyptic number.

It is an amenable number.

320428432840 is an abundant number, since it is smaller than the sum of its proper divisors (438604034360).

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

320428432840 is a wasteful number, since it uses less digits than its factorization.

320428432840 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 68374 (or 68370 counting only the distinct ones).

The product of its (nonzero) digits is 294912, while the sum is 40.

The spelling of 320428432840 in words is "three hundred twenty billion, four hundred twenty-eight million, four hundred thirty-two thousand, eight hundred forty".