28978344 has 128 divisors (see below), whose sum is σ = 88704000. Its totient is φ = 8724672.

The previous prime is 28978343. The next prime is 28978357. The reversal of 28978344 is 44387982.

It is a self number, because there is not a number n which added to its sum of digits gives 28978344.

It is not an unprimeable number, because it can be changed into a prime (28978343) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 94239 + ... + 94545.

It is an arithmetic number, because the mean of its divisors is an integer number (693000).

Almost surely, 2^28978344 is an apocalyptic number.

28978344 is a gapful number since it is divisible by the number (24) 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 28978344, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (44352000).

28978344 is an abundant number, since it is smaller than the sum of its proper divisors (59725656).

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

28978344 is a wasteful number, since it uses less digits than its factorization.

28978344 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 364 (or 354 counting only the distinct ones).

The product of its digits is 387072, while the sum is 45.

The square root of 28978344 is about 5383.1537224939. The cubic root of 28978344 is about 307.1551875552.

The spelling of 28978344 in words is "twenty-eight million, nine hundred seventy-eight thousand, three hundred forty-four".