28155946 has 32 divisors (see below), whose sum is σ = 52778880. Its totient is φ = 10967616.

The previous prime is 28155931. The next prime is 28155947. The reversal of 28155946 is 64955182.

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a junction number, because it is equal to n+sod(n) for n = 28155899 and 28155908.

It is not an unprimeable number, because it can be changed into a prime (28155947) by changing a digit.

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 15 ways as a sum of consecutive naturals, for example, 11040 + ... + 13348.

It is an arithmetic number, because the mean of its divisors is an integer number (1649340).

Almost surely, 2^28155946 is an apocalyptic number.

28155946 is a gapful number since it is divisible by the number (26) formed by its first and last digit.

28155946 is a deficient number, since it is larger than the sum of its proper divisors (24622934).

28155946 is a wasteful number, since it uses less digits than its factorization.

28155946 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2398.

The product of its digits is 86400, while the sum is 40.

The square root of 28155946 is about 5306.2176736353. The cubic root of 28155946 is about 304.2215965681.

The spelling of 28155946 in words is "twenty-eight million, one hundred fifty-five thousand, nine hundred forty-six".