28776858 has 16 divisors (see below), whose sum is σ = 62786016. Its totient is φ = 8720240.

The previous prime is 28776857. The next prime is 28776863. The reversal of 28776858 is 85867782.

It is a self number, because there is not a number n which added to its sum of digits gives 28776858.

It is not an unprimeable number, because it can be changed into a prime (28776851) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 217941 + ... + 218072.

It is an arithmetic number, because the mean of its divisors is an integer number (3924126).

Almost surely, 2^28776858 is an apocalyptic number.

28776858 is an abundant number, since it is smaller than the sum of its proper divisors (34009158).

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

28776858 is a wasteful number, since it uses less digits than its factorization.

28776858 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 436029.

The product of its digits is 1505280, while the sum is 51.

The square root of 28776858 is about 5364.4065841433. The cubic root of 28776858 is about 306.4416494158.

The spelling of 28776858 in words is "twenty-eight million, seven hundred seventy-six thousand, eight hundred fifty-eight".