28918806 has 16 divisors (see below), whose sum is σ = 66100224. Its totient is φ = 8262504.

The previous prime is 28918787. The next prime is 28918823. The reversal of 28918806 is 60881982.

It is a Harshad number since it is a multiple of its sum of digits (42), and also a Moran number because the ratio is a prime number: 688543 = 28918806 / (2 + 8 + 9 + 1 + 8 + 8 + 0 + 6).

It is a congruent number.

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 7 ways as a sum of consecutive naturals, for example, 344230 + ... + 344313.

It is an arithmetic number, because the mean of its divisors is an integer number (4131264).

Almost surely, 2^28918806 is an apocalyptic number.

28918806 is an abundant number, since it is smaller than the sum of its proper divisors (37181418).

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

28918806 is a wasteful number, since it uses less digits than its factorization.

28918806 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 688555.

The product of its (nonzero) digits is 55296, while the sum is 42.

The square root of 28918806 is about 5377.6208494092. The cubic root of 28918806 is about 306.9446861762.

The spelling of 28918806 in words is "twenty-eight million, nine hundred eighteen thousand, eight hundred six".