28785294 has 32 divisors (see below), whose sum is σ = 64766880. Its totient is φ = 9593640.

The previous prime is 28785293. The next prime is 28785331. The reversal of 28785294 is 49258782.

28785294 is a `hidden beast` number, since 287 + 85 + 294 = 666.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28785293) 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, 1084 + ... + 7664.

It is an arithmetic number, because the mean of its divisors is an integer number (2023965).

Almost surely, 2^28785294 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 28785294, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (32383440).

28785294 is an abundant number, since it is smaller than the sum of its proper divisors (35981586).

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

28785294 is an frugal number, since it uses more digits than its factorization.

28785294 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6604 (or 6586 counting only the distinct ones).

The product of its digits is 322560, while the sum is 45.

The square root of 28785294 is about 5365.1928203933. The cubic root of 28785294 is about 306.4715911741.

It can be divided in two parts, 2 and 8785294, that added together give a square (8785296 = 2964²).

The spelling of 28785294 in words is "twenty-eight million, seven hundred eighty-five thousand, two hundred ninety-four".