320861280 has 96 divisors (see below), whose sum is σ = 1024670304. Its totient is φ = 84381696.

The previous prime is 320861273. The next prime is 320861297. The reversal of 320861280 is 82168023.

320861280 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a tau number, because it is divible by the number of its divisors (96).

It is a super-2 number, since 2×320861280² = 205903922006476800, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 30462 + ... + 39618.

It is an arithmetic number, because the mean of its divisors is an integer number (10673649).

Almost surely, 2^320861280 is an apocalyptic number.

320861280 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 320861280, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (512335152).

320861280 is an abundant number, since it is smaller than the sum of its proper divisors (703809024).

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

320861280 is a wasteful number, since it uses less digits than its factorization.

320861280 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9248 (or 9240 counting only the distinct ones).

The product of its (nonzero) digits is 4608, while the sum is 30.

The square root of 320861280 is about 17912.6011511450. The cubic root of 320861280 is about 684.6034823111.

The spelling of 320861280 in words is "three hundred twenty million, eight hundred sixty-one thousand, two hundred eighty".