28774788 has 48 divisors (see below), whose sum is σ = 76997760. Its totient is φ = 8193024.

The previous prime is 28774777. The next prime is 28774793. The reversal of 28774788 is 88747782.

It is a self number, because there is not a number n which added to its sum of digits gives 28774788.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 42420 + ... + 43092.

It is an arithmetic number, because the mean of its divisors is an integer number (1604120).

Almost surely, 2^28774788 is an apocalyptic number.

28774788 is a gapful number since it is divisible by the number (28) formed by its first and last digit.

It is an amenable number.

28774788 is an abundant number, since it is smaller than the sum of its proper divisors (48222972).

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

28774788 is a wasteful number, since it uses less digits than its factorization.

28774788 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1196 (or 1194 counting only the distinct ones).

The product of its digits is 1404928, while the sum is 51.

The square root of 28774788 is about 5364.2136422779. The cubic root of 28774788 is about 306.4343015042.

The spelling of 28774788 in words is "twenty-eight million, seven hundred seventy-four thousand, seven hundred eighty-eight".