28861248 has 112 divisors (see below), whose sum is σ = 85116416. Its totient is φ = 8570880.

The previous prime is 28861241. The next prime is 28861249. The reversal of 28861248 is 84216882.

It is a super-2 number, since 2×28861248² = 1665943272235008, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (39).

It is a nude number because it is divisible by every one of its digits.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28861241) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 77190 + ... + 77562.

It is an arithmetic number, because the mean of its divisors is an integer number (759968).

Almost surely, 2^28861248 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 28861248, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (42558208).

28861248 is an abundant number, since it is smaller than the sum of its proper divisors (56255168).

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

28861248 is a wasteful number, since it uses less digits than its factorization.

28861248 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 432 (or 422 counting only the distinct ones).

The product of its digits is 49152, while the sum is 39.

The square root of 28861248 is about 5372.2665607730. The cubic root of 28861248 is about 306.7409104006.

The spelling of 28861248 in words is "twenty-eight million, eight hundred sixty-one thousand, two hundred forty-eight".