38420728 has 32 divisors (see below), whose sum is σ = 73901520. Its totient is φ = 18720000.

The previous prime is 38420719. The next prime is 38420771. The reversal of 38420728 is 82702483.

It is a junction number, because it is equal to n+sod(n) for n = 38420693 and 38420702.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 63628 + ... + 64228.

Almost surely, 2^38420728 is an apocalyptic number.

It is an amenable number.

38420728 is a deficient number, since it is larger than the sum of its proper divisors (35480792).

38420728 is a wasteful number, since it uses less digits than its factorization.

38420728 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 799 (or 795 counting only the distinct ones).

The product of its (nonzero) digits is 21504, while the sum is 34.

The square root of 38420728 is about 6198.4456116030. The cubic root of 38420728 is about 337.4337589247.

It can be divided in two parts, 384 and 20728, that added together give a palindrome (21112).

The spelling of 38420728 in words is "thirty-eight million, four hundred twenty thousand, seven hundred twenty-eight".