38728845 has 12 divisors (see below), whose sum is σ = 67130076. Its totient is φ = 20655360.

The previous prime is 38728831. The next prime is 38728871. The reversal of 38728845 is 54882783.

It can be written as a sum of positive squares in 2 ways, for example, as 23213124 + 15515721 = 4818^2 + 3939^2 .

It is not a de Polignac number, because 38728845 - 2¹¹ = 38726797 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (45), and also a Moran number because the ratio is a prime number: 860641 = 38728845 / (3 + 8 + 7 + 2 + 8 + 8 + 4 + 5).

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 38728845.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 430276 + ... + 430365.

It is an arithmetic number, because the mean of its divisors is an integer number (5594173).

Almost surely, 2^38728845 is an apocalyptic number.

It is an amenable number.

38728845 is a deficient number, since it is larger than the sum of its proper divisors (28401231).

38728845 is a wasteful number, since it uses less digits than its factorization.

38728845 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 860652 (or 860649 counting only the distinct ones).

The product of its digits is 430080, while the sum is 45.

The square root of 38728845 is about 6223.2503565259. The cubic root of 38728845 is about 338.3333807879. Note that the first 4 decimals are identical.

The spelling of 38728845 in words is "thirty-eight million, seven hundred twenty-eight thousand, eight hundred forty-five".