381309680 has 20 divisors (see below), whose sum is σ = 886545192. Its totient is φ = 152523840.

The previous prime is 381309667. The next prime is 381309739. The reversal of 381309680 is 86903183.

It is a tau number, because it is divible by the number of its divisors (20).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2383106 + ... + 2383265.

Almost surely, 2^381309680 is an apocalyptic number.

It is an amenable number.

381309680 is an abundant number, since it is smaller than the sum of its proper divisors (505235512).

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

381309680 is a wasteful number, since it uses less digits than its factorization.

381309680 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4766384 (or 4766378 counting only the distinct ones).

The product of its (nonzero) digits is 31104, while the sum is 38.

The square root of 381309680 is about 19527.1523781631. The cubic root of 381309680 is about 725.1468145007.

The spelling of 381309680 in words is "three hundred eighty-one million, three hundred nine thousand, six hundred eighty".