28156068 has 18 divisors (see below), whose sum is σ = 71172374. Its totient is φ = 9385344.

The previous prime is 28156067. The next prime is 28156123. The reversal of 28156068 is 86065182.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 15539364 + 12616704 = 3942^2 + 3552^2 .

It is a tau number, because it is divible by the number of its divisors (18).

It is a Harshad number since it is a multiple of its sum of digits (36), and also a Moran number because the ratio is a prime number: 782113 = 28156068 / (2 + 8 + 1 + 5 + 6 + 0 + 6 + 8).

It is not an unprimeable number, because it can be changed into a prime (28156061) 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 5 ways as a sum of consecutive naturals, for example, 391021 + ... + 391092.

Almost surely, 2^28156068 is an apocalyptic number.

It is an amenable number.

28156068 is an abundant number, since it is smaller than the sum of its proper divisors (43016306).

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

28156068 is a wasteful number, since it uses less digits than its factorization.

28156068 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 782123 (or 782118 counting only the distinct ones).

The product of its (nonzero) digits is 23040, while the sum is 36.

The square root of 28156068 is about 5306.2291695704. The cubic root of 28156068 is about 304.2220359659. Note that the first 3 decimals are identical.

The spelling of 28156068 in words is "twenty-eight million, one hundred fifty-six thousand, sixty-eight".