38728866 has 16 divisors (see below), whose sum is σ = 84499488. Its totient is φ = 11736000.

The previous prime is 38728831. The next prime is 38728871. The reversal of 38728866 is 66882783.

It is a happy number.

38728866 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 293335 + ... + 293466.

It is an arithmetic number, because the mean of its divisors is an integer number (5281218).

Almost surely, 2^38728866 is an apocalyptic number.

38728866 is an abundant number, since it is smaller than the sum of its proper divisors (45770622).

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

38728866 is a wasteful number, since it uses less digits than its factorization.

38728866 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 586817.

The product of its digits is 774144, while the sum is 48.

The square root of 38728866 is about 6223.2520437469. The cubic root of 38728866 is about 338.3334419396. Note that the first 3 decimals are identical.

The spelling of 38728866 in words is "thirty-eight million, seven hundred twenty-eight thousand, eight hundred sixty-six".