28776408 has 64 divisors (see below), whose sum is σ = 74511360. Its totient is φ = 9255936.

The previous prime is 28776379. The next prime is 28776421. The reversal of 28776408 is 80467782.

It is a self number, because there is not a number n which added to its sum of digits gives 28776408.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 109285 + ... + 109547.

It is an arithmetic number, because the mean of its divisors is an integer number (1164240).

Almost surely, 2^28776408 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 28776408, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (37255680).

28776408 is an abundant number, since it is smaller than the sum of its proper divisors (45734952).

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

28776408 is a wasteful number, since it uses less digits than its factorization.

28776408 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 416 (or 412 counting only the distinct ones).

The product of its (nonzero) digits is 150528, while the sum is 42.

The square root of 28776408 is about 5364.3646408498. The cubic root of 28776408 is about 306.4400520737.

The spelling of 28776408 in words is "twenty-eight million, seven hundred seventy-six thousand, four hundred eight".