381746728 has 16 divisors (see below), whose sum is σ = 780845760. Its totient is φ = 173521200.

The previous prime is 381746671. The next prime is 381746731. The reversal of 381746728 is 827647183.

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, 2168928 + ... + 2169103.

It is an arithmetic number, because the mean of its divisors is an integer number (48802860).

Almost surely, 2^381746728 is an apocalyptic number.

It is an amenable number.

381746728 is an abundant number, since it is smaller than the sum of its proper divisors (399099032).

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

381746728 is a wasteful number, since it uses less digits than its factorization.

381746728 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4338048 (or 4338044 counting only the distinct ones).

The product of its digits is 451584, while the sum is 46.

The square root of 381746728 is about 19538.3399499548. The cubic root of 381746728 is about 725.4237573419.

The spelling of 381746728 in words is "three hundred eighty-one million, seven hundred forty-six thousand, seven hundred twenty-eight".