28874538 has 96 divisors (see below), whose sum is σ = 79252992. Its totient is φ = 7380000.

The previous prime is 28874501. The next prime is 28874539. The reversal of 28874538 is 83547882.

It is a junction number, because it is equal to n+sod(n) for n = 28874493 and 28874502.

It is not an unprimeable number, because it can be changed into a prime (28874539) 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 47 ways as a sum of consecutive naturals, for example, 114913 + ... + 115163.

It is an arithmetic number, because the mean of its divisors is an integer number (825552).

Almost surely, 2^28874538 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 28874538, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (39626496).

28874538 is an abundant number, since it is smaller than the sum of its proper divisors (50378454).

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

28874538 is a wasteful number, since it uses less digits than its factorization.

28874538 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 360 (or 357 counting only the distinct ones).

The product of its digits is 430080, while the sum is 45.

The square root of 28874538 is about 5373.5033265087. The cubic root of 28874538 is about 306.7879857631.

The spelling of 28874538 in words is "twenty-eight million, eight hundred seventy-four thousand, five hundred thirty-eight".