38665728 has 80 divisors (see below), whose sum is σ = 114494160. Its totient is φ = 12883968.

The previous prime is 38665721. The next prime is 38665793. The reversal of 38665728 is 82756683.

It is a zygodrome in base 8.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (38665721) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 12426 + ... + 15222.

It is an arithmetic number, because the mean of its divisors is an integer number (1431177).

Almost surely, 2^38665728 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 38665728, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (57247080).

38665728 is an abundant number, since it is smaller than the sum of its proper divisors (75828432).

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

38665728 is an equidigital number, since it uses as much as digits as its factorization.

38665728 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2824 (or 2802 counting only the distinct ones).

The product of its digits is 483840, while the sum is 45.

The square root of 38665728 is about 6218.1772248787. The cubic root of 38665728 is about 338.1494851313.

It can be divided in two parts, 38665 and 728, that added together give a palindrome (39393).

The spelling of 38665728 in words is "thirty-eight million, six hundred sixty-five thousand, seven hundred twenty-eight".