320781120 has 224 divisors, whose sum is σ = 1142487936. Its totient is φ = 75571200.

The previous prime is 320781113. The next prime is 320781137. The reversal of 320781120 is 21187023.

320781120 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a Harshad number since it is a multiple of its sum of digits (24).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 390310 + ... + 391130.

Almost surely, 2^320781120 is an apocalyptic number.

320781120 is a gapful number since it is divisible by the number (30) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 320781120, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (571243968).

320781120 is an abundant number, since it is smaller than the sum of its proper divisors (821706816).

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

320781120 is a wasteful number, since it uses less digits than its factorization.

320781120 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 889 (or 879 counting only the distinct ones).

The product of its (nonzero) digits is 672, while the sum is 24.

The square root of 320781120 is about 17910.3634803987. The cubic root of 320781120 is about 684.5464666170.

The spelling of 320781120 in words is "three hundred twenty million, seven hundred eighty-one thousand, one hundred twenty".