28778036 has 12 divisors (see below), whose sum is σ = 57556128. Its totient is φ = 12333432.

The previous prime is 28778021. The next prime is 28778039. The reversal of 28778036 is 63087782.

28778036 is an admirable number.

It is a hoax number, since the sum of its digits (41) coincides with the sum of the digits of its distinct prime factors.

It is a junction number, because it is equal to n+sod(n) for n = 28777984 and 28778002.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28778039) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 513866 + ... + 513921.

It is an arithmetic number, because the mean of its divisors is an integer number (4796344).

Almost surely, 2^28778036 is an apocalyptic number.

It is an amenable number.

28778036 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

28778036 is a wasteful number, since it uses less digits than its factorization.

28778036 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1027798 (or 1027796 counting only the distinct ones).

The product of its (nonzero) digits is 112896, while the sum is 41.

The square root of 28778036 is about 5364.5163808120. The cubic root of 28778036 is about 306.4458308236.

The spelling of 28778036 in words is "twenty-eight million, seven hundred seventy-eight thousand, thirty-six".