28156104 has 24 divisors (see below), whose sum is σ = 76256310. Its totient is φ = 9385344.

The previous prime is 28156067. The next prime is 28156123. The reversal of 28156104 is 40165182.

It can be written as a sum of positive squares in only one way, i.e., 15920100 + 12236004 = 3990^2 + 3498^2 .

It is a tau number, because it is divible by the number of its divisors (24).

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 5 ways as a sum of consecutive naturals, for example, 195457 + ... + 195600.

Almost surely, 2^28156104 is an apocalyptic number.

28156104 is a gapful number since it is divisible by the number (24) formed by its first and last digit.

It is an amenable number.

28156104 is an abundant number, since it is smaller than the sum of its proper divisors (48100206).

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

28156104 is a wasteful number, since it uses less digits than its factorization.

28156104 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 391069 (or 391062 counting only the distinct ones).

The product of its (nonzero) digits is 1920, while the sum is 27.

The square root of 28156104 is about 5306.2325618088. The cubic root of 28156104 is about 304.2221656240. Note that the first 3 decimals are identical.

The spelling of 28156104 in words is "twenty-eight million, one hundred fifty-six thousand, one hundred four".