28156992 has 56 divisors (see below), whose sum is σ = 75931776. Its totient is φ = 9205248.

The previous prime is 28156969. The next prime is 28157027. The reversal of 28156992 is 29965182.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 8793 + ... + 11559.

Almost surely, 2^28156992 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 28156992, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (37965888).

28156992 is an abundant number, since it is smaller than the sum of its proper divisors (47774784).

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

28156992 is a wasteful number, since it uses less digits than its factorization.

28156992 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2835 (or 2825 counting only the distinct ones).

The product of its digits is 77760, while the sum is 42.

The square root of 28156992 is about 5306.3162363357. The cubic root of 28156992 is about 304.2253638227.

The spelling of 28156992 in words is "twenty-eight million, one hundred fifty-six thousand, nine hundred ninety-two".