380643728 has 20 divisors (see below), whose sum is σ = 740374860. Its totient is φ = 189579264.

The previous prime is 380643707. The next prime is 380643733. The reversal of 380643728 is 827346083.

It can be written as a sum of positive squares in 2 ways, for example, as 213510544 + 167133184 = 14612^2 + 12928^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 42173 + ... + 50396.

It is an arithmetic number, because the mean of its divisors is an integer number (37018743).

Almost surely, 2^380643728 is an apocalyptic number.

It is an amenable number.

380643728 is a deficient number, since it is larger than the sum of its proper divisors (359731132).

380643728 is a wasteful number, since it uses less digits than its factorization.

380643728 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 92834 (or 92828 counting only the distinct ones).

The product of its (nonzero) digits is 193536, while the sum is 41.

The square root of 380643728 is about 19510.0929777385. The cubic root of 380643728 is about 724.7244155921.

The spelling of 380643728 in words is "three hundred eighty million, six hundred forty-three thousand, seven hundred twenty-eight".