28156071 has 16 divisors (see below), whose sum is σ = 40527360. Its totient is φ = 17334240.

The previous prime is 28156067. The next prime is 28156123. The reversal of 28156071 is 17065182.

It is not a de Polignac number, because 28156071 - 2² = 28156067 is a prime.

It is a congruent number.

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 (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 5035 + ... + 9036.

It is an arithmetic number, because the mean of its divisors is an integer number (2532960).

Almost surely, 2^28156071 is an apocalyptic number.

28156071 is a deficient number, since it is larger than the sum of its proper divisors (12371289).

28156071 is a wasteful number, since it uses less digits than its factorization.

28156071 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14126.

The product of its (nonzero) digits is 3360, while the sum is 30.

The square root of 28156071 is about 5306.2294522570. The cubic root of 28156071 is about 304.2220467708. Note that the first 3 decimals are identical.

The spelling of 28156071 in words is "twenty-eight million, one hundred fifty-six thousand, seventy-one".