28997028 has 60 divisors (see below), whose sum is σ = 78276352. Its totient is φ = 9350640.

The previous prime is 28997027. The next prime is 28997041. The reversal of 28997028 is 82079982.

It is a Smith number, since the sum of its digits (45) coincides with the sum of the digits of its prime factors.

It is not an unprimeable number, because it can be changed into a prime (28997027) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 8601 + ... + 11487.

Almost surely, 2^28997028 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 28997028, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (39138176).

28997028 is an abundant number, since it is smaller than the sum of its proper divisors (49279324).

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

28997028 is a wasteful number, since it uses less digits than its factorization.

28997028 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2934 (or 2923 counting only the distinct ones).

The product of its (nonzero) digits is 145152, while the sum is 45.

The square root of 28997028 is about 5384.8888567918. Note that the first 4 decimals coincide. The cubic root of 28997028 is about 307.2211868932.

The spelling of 28997028 in words is "twenty-eight million, nine hundred ninety-seven thousand, twenty-eight".