28927866 has 16 divisors (see below), whose sum is σ = 63115488. Its totient is φ = 8766000.

The previous prime is 28927817. The next prime is 28927879. The reversal of 28927866 is 66872982.

It is a happy number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 219085 + ... + 219216.

It is an arithmetic number, because the mean of its divisors is an integer number (3944718).

Almost surely, 2^28927866 is an apocalyptic number.

28927866 is an abundant number, since it is smaller than the sum of its proper divisors (34187622).

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

28927866 is a wasteful number, since it uses less digits than its factorization.

28927866 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 438317.

The product of its digits is 580608, while the sum is 48.

The square root of 28927866 is about 5378.4631633953. The cubic root of 28927866 is about 306.9767371594.

Subtracting 28927866 from its reverse (66872982), we obtain a triangular number (37945116 = T₈₇₁₁).

The spelling of 28927866 in words is "twenty-eight million, nine hundred twenty-seven thousand, eight hundred sixty-six".