380805728 has 48 divisors (see below), whose sum is σ = 779874480. Its totient is φ = 182816256.

The previous prime is 380805713. The next prime is 380805749. The reversal of 380805728 is 827508083.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 181775 + ... + 183857.

It is an arithmetic number, because the mean of its divisors is an integer number (16247385).

Almost surely, 2^380805728 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 380805728, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (389937240).

380805728 is an abundant number, since it is smaller than the sum of its proper divisors (399068752).

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

380805728 is a wasteful number, since it uses less digits than its factorization.

380805728 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2319 (or 2311 counting only the distinct ones).

The product of its (nonzero) digits is 107520, while the sum is 41.

The square root of 380805728 is about 19514.2442333799. The cubic root of 380805728 is about 724.8272139964.

The spelling of 380805728 in words is "three hundred eighty million, eight hundred five thousand, seven hundred twenty-eight".