28156803 has 8 divisors (see below), whose sum is σ = 39518400. Its totient is φ = 17783208.

The previous prime is 28156781. The next prime is 28156823. The reversal of 28156803 is 30865182.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 28156803 - 2⁸ = 28156547 is a prime.

It is not an unprimeable number, because it can be changed into a prime (28156823) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 246933 + ... + 247046.

It is an arithmetic number, because the mean of its divisors is an integer number (4939800).

Almost surely, 2^28156803 is an apocalyptic number.

28156803 is a deficient number, since it is larger than the sum of its proper divisors (11361597).

28156803 is a wasteful number, since it uses less digits than its factorization.

28156803 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 494001.

The product of its (nonzero) digits is 11520, while the sum is 33.

The square root of 28156803 is about 5306.2984273409. The cubic root of 28156803 is about 304.2246831307.

The spelling of 28156803 in words is "twenty-eight million, one hundred fifty-six thousand, eight hundred three".