28778382 has 128 divisors (see below), whose sum is σ = 74649600. Its totient is φ = 8160768.

The previous prime is 28778381. The next prime is 28778389. The reversal of 28778382 is 28387782.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28778381) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 612283 + ... + 612329.

It is an arithmetic number, because the mean of its divisors is an integer number (583200).

Almost surely, 2^28778382 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 28778382, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (37324800).

28778382 is an abundant number, since it is smaller than the sum of its proper divisors (45871218).

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

28778382 is a wasteful number, since it uses less digits than its factorization.

28778382 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 127 (or 121 counting only the distinct ones).

The product of its digits is 301056, while the sum is 45.

The square root of 28778382 is about 5364.5486296612. The cubic root of 28778382 is about 306.4470589574.

The spelling of 28778382 in words is "twenty-eight million, seven hundred seventy-eight thousand, three hundred eighty-two".