320778432 has 84 divisors (see below), whose sum is σ = 990203760. Its totient is φ = 98698752.

The previous prime is 320778413. The next prime is 320778433. The reversal of 320778432 is 234877023.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is not an unprimeable number, because it can be changed into a prime (320778433) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 13932 + ... + 28907.

It is an arithmetic number, because the mean of its divisors is an integer number (11788140).

Almost surely, 2^320778432 is an apocalyptic number.

320778432 is a gapful number since it is divisible by the number (32) formed by its first and last digit.

It is an amenable number.

320778432 is an abundant number, since it is smaller than the sum of its proper divisors (669425328).

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

320778432 is a wasteful number, since it uses less digits than its factorization.

320778432 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 42870 (or 42857 counting only the distinct ones).

The product of its (nonzero) digits is 56448, while the sum is 36.

The square root of 320778432 is about 17910.2884398884. The cubic root of 320778432 is about 684.5445545489.

The spelling of 320778432 in words is "three hundred twenty million, seven hundred seventy-eight thousand, four hundred thirty-two".