28681776 has 70 divisors (see below), whose sum is σ = 83352180. Its totient is φ = 9556704.

The previous prime is 28681753. The next prime is 28681781. The reversal of 28681776 is 67718682.

It is an unprimeable number.

It is a polite number, since it can be written in 13 ways as a sum of consecutive naturals, for example, 10435 + ... + 12893.

Almost surely, 2^28681776 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 28681776, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (41676090).

28681776 is an abundant number, since it is smaller than the sum of its proper divisors (54670404).

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

28681776 is an equidigital number, since it uses as much as digits as its factorization.

28681776 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2485 (or 2464 counting only the distinct ones).

The product of its digits is 225792, while the sum is 45.

The square root of 28681776 is about 5355.5369478699. The cubic root of 28681776 is about 306.1037710335.

The spelling of 28681776 in words is "twenty-eight million, six hundred eighty-one thousand, seven hundred seventy-six".