28998728 has 32 divisors (see below), whose sum is σ = 59616000. Its totient is φ = 13114560.

The previous prime is 28998721. The next prime is 28998737. The reversal of 28998728 is 82789982.

It is a self number, because there is not a number n which added to its sum of digits gives 28998728.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28998721) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 19433 + ... + 20871.

It is an arithmetic number, because the mean of its divisors is an integer number (1863000).

Almost surely, 2^28998728 is an apocalyptic number.

It is an amenable number.

28998728 is an abundant number, since it is smaller than the sum of its proper divisors (30617272).

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

28998728 is a wasteful number, since it uses less digits than its factorization.

28998728 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1685 (or 1681 counting only the distinct ones).

The product of its digits is 1161216, while the sum is 53.

The square root of 28998728 is about 5385.0467036043. The cubic root of 28998728 is about 307.2271905638.

The spelling of 28998728 in words is "twenty-eight million, nine hundred ninety-eight thousand, seven hundred twenty-eight".