28806378 has 16 divisors (see below), whose sum is σ = 59471616. Its totient is φ = 9292320.

The previous prime is 28806377. The next prime is 28806383. The reversal of 28806378 is 87360882.

It is not an unprimeable number, because it can be changed into a prime (28806377) 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, 77251 + ... + 77622.

It is an arithmetic number, because the mean of its divisors is an integer number (3716976).

Almost surely, 2^28806378 is an apocalyptic number.

28806378 is an abundant number, since it is smaller than the sum of its proper divisors (30665238).

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

28806378 is a wasteful number, since it uses less digits than its factorization.

28806378 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 154909.

The product of its (nonzero) digits is 129024, while the sum is 42.

The square root of 28806378 is about 5367.1573481686. The cubic root of 28806378 is about 306.5463987019.

The spelling of 28806378 in words is "twenty-eight million, eight hundred six thousand, three hundred seventy-eight".