28777828 has 12 divisors (see below), whose sum is σ = 50424192. Its totient is φ = 14370920.

The previous prime is 28777817. The next prime is 28777877. The reversal of 28777828 is 82877782.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 508 + ... + 7603.

It is an arithmetic number, because the mean of its divisors is an integer number (4202016).

Almost surely, 2^28777828 is an apocalyptic number.

It is an amenable number.

28777828 is a deficient number, since it is larger than the sum of its proper divisors (21646364).

28777828 is a wasteful number, since it uses less digits than its factorization.

28777828 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9002 (or 9000 counting only the distinct ones).

The product of its digits is 702464, while the sum is 49.

The square root of 28777828 is about 5364.4969941272. The cubic root of 28777828 is about 306.4450925188.

The spelling of 28777828 in words is "twenty-eight million, seven hundred seventy-seven thousand, eight hundred twenty-eight".