38857728 has 176 divisors, whose sum is σ = 128387840. Its totient is φ = 10174464.

The previous prime is 38857723. The next prime is 38857739. The reversal of 38857728 is 82775883.

It is a Harshad number since it is a multiple of its sum of digits (48).

It is not an unprimeable number, because it can be changed into a prime (38857723) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 279483 + ... + 279621.

Almost surely, 2^38857728 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 38857728, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (64193920).

38857728 is an abundant number, since it is smaller than the sum of its proper divisors (89530112).

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

38857728 is a wasteful number, since it uses less digits than its factorization.

38857728 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 182 (or 164 counting only the distinct ones).

The product of its digits is 752640, while the sum is 48.

The square root of 38857728 is about 6233.5967145782. The cubic root of 38857728 is about 338.7082705277.

The spelling of 38857728 in words is "thirty-eight million, eight hundred fifty-seven thousand, seven hundred twenty-eight".