320781252 has 48 divisors (see below), whose sum is σ = 824652864. Its totient is φ = 96240000.

The previous prime is 320781239. The next prime is 320781257. The reversal of 320781252 is 252187023.

It is a super-2 number, since 2×320781252² = 205801223269375008, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (320781257) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1302 + ... + 25362.

It is an arithmetic number, because the mean of its divisors is an integer number (17180268).

Almost surely, 2^320781252 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 320781252, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (412326432).

320781252 is an abundant number, since it is smaller than the sum of its proper divisors (503871612).

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

320781252 is a wasteful number, since it uses less digits than its factorization.

320781252 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24180 (or 24178 counting only the distinct ones).

The product of its (nonzero) digits is 6720, while the sum is 30.

The square root of 320781252 is about 17910.3671654157. The cubic root of 320781252 is about 684.5465605130.

The spelling of 320781252 in words is "three hundred twenty million, seven hundred eighty-one thousand, two hundred fifty-two".