38728261 has 32 divisors (see below), whose sum is σ = 48988800. Its totient is φ = 30074880.

The previous prime is 38728259. The next prime is 38728271. The reversal of 38728261 is 16282783.

38728261 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 38728261 - 2¹ = 38728259 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 38728261.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (38728241) by changing a digit.

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 31 ways as a sum of consecutive naturals, for example, 216270 + ... + 216448.

It is an arithmetic number, because the mean of its divisors is an integer number (1530900).

Almost surely, 2^38728261 is an apocalyptic number.

It is an amenable number.

38728261 is a deficient number, since it is larger than the sum of its proper divisors (10260539).

38728261 is a wasteful number, since it uses less digits than its factorization.

38728261 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 309.

The product of its digits is 32256, while the sum is 37.

The square root of 38728261 is about 6223.2034355306. The cubic root of 38728261 is about 338.3316801804.

The spelling of 38728261 in words is "thirty-eight million, seven hundred twenty-eight thousand, two hundred sixty-one".