387091728 has 30 divisors (see below), whose sum is σ = 1083319614. Its totient is φ = 129030528.

The previous prime is 387091721. The next prime is 387091729. The reversal of 387091728 is 827190783.

It can be written as a sum of positive squares in only one way, i.e., 363588624 + 23503104 = 19068^2 + 4848^2 .

It is a nialpdrome in base 12.

It is not an unprimeable number, because it can be changed into a prime (387091721) by changing a digit.

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 5 ways as a sum of consecutive naturals, for example, 1343925 + ... + 1344212.

Almost surely, 2^387091728 is an apocalyptic number.

It is an amenable number.

387091728 is an abundant number, since it is smaller than the sum of its proper divisors (696227886).

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

387091728 is a wasteful number, since it uses less digits than its factorization.

387091728 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2688151 (or 2688142 counting only the distinct ones).

The product of its (nonzero) digits is 169344, while the sum is 45.

The square root of 387091728 is about 19674.6468329167. The cubic root of 387091728 is about 728.7937343699.

The spelling of 387091728 in words is "three hundred eighty-seven million, ninety-one thousand, seven hundred twenty-eight".