28969388 has 36 divisors (see below), whose sum is σ = 59964912. Its totient is φ = 12206880.

The previous prime is 28969387. The next prime is 28969403. The reversal of 28969388 is 88396982.

It is not an unprimeable number, because it can be changed into a prime (28969387) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 10745 + ... + 13167.

It is an arithmetic number, because the mean of its divisors is an integer number (1665692).

Almost surely, 2^28969388 is an apocalyptic number.

28969388 is a gapful number since it is divisible by the number (28) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 28969388, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (29982456).

28969388 is an abundant number, since it is smaller than the sum of its proper divisors (30995524).

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

28969388 is a wasteful number, since it uses less digits than its factorization.

28969388 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2502 (or 2493 counting only the distinct ones).

The product of its digits is 1492992, while the sum is 53.

The square root of 28969388 is about 5382.3218038315. The cubic root of 28969388 is about 307.1235413334.

The spelling of 28969388 in words is "twenty-eight million, nine hundred sixty-nine thousand, three hundred eighty-eight".