28015938 has 12 divisors (see below), whose sum is σ = 60701238. Its totient is φ = 9338640.

The previous prime is 28015931. The next prime is 28015957. The reversal of 28015938 is 83951082.

It can be written as a sum of positive squares in only one way, i.e., 21650409 + 6365529 = 4653^2 + 2523^2 .

It is not an unprimeable number, because it can be changed into a prime (28015931) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 778203 + ... + 778238.

Almost surely, 2^28015938 is an apocalyptic number.

28015938 is an abundant number, since it is smaller than the sum of its proper divisors (32685300).

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

28015938 is a wasteful number, since it uses less digits than its factorization.

28015938 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1556449 (or 1556446 counting only the distinct ones).

The product of its (nonzero) digits is 17280, while the sum is 36.

The square root of 28015938 is about 5293.0084073238. The cubic root of 28015938 is about 303.7165019199.

The spelling of 28015938 in words is "twenty-eight million, fifteen thousand, nine hundred thirty-eight".