28778274 has 64 divisors (see below), whose sum is σ = 76953600. Its totient is φ = 7787664.

The previous prime is 28778273. The next prime is 28778329. The reversal of 28778274 is 47287782.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (28778273) 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, 5179 + ... + 9185.

It is an arithmetic number, because the mean of its divisors is an integer number (1202400).

Almost surely, 2^28778274 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 28778274, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (38476800).

28778274 is an abundant number, since it is smaller than the sum of its proper divisors (48175326).

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

28778274 is a wasteful number, since it uses less digits than its factorization.

28778274 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4044 (or 4038 counting only the distinct ones).

The product of its digits is 351232, while the sum is 45.

The square root of 28778274 is about 5364.5385635672. The cubic root of 28778274 is about 306.4466756103.

The spelling of 28778274 in words is "twenty-eight million, seven hundred seventy-eight thousand, two hundred seventy-four".