28881156 has 12 divisors (see below), whose sum is σ = 67389392. Its totient is φ = 9627048.

The previous prime is 28881143. The next prime is 28881161. The reversal of 28881156 is 65118882.

It is a tau number, because it is divible by the number of its divisors (12).

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1203370 + ... + 1203393.

Almost surely, 2^28881156 is an apocalyptic number.

It is an amenable number.

28881156 is an abundant number, since it is smaller than the sum of its proper divisors (38508236).

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

28881156 is a wasteful number, since it uses less digits than its factorization.

28881156 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2406770 (or 2406768 counting only the distinct ones).

The product of its digits is 30720, while the sum is 39.

The square root of 28881156 is about 5374.1190906045. The cubic root of 28881156 is about 306.8114224185.

The spelling of 28881156 in words is "twenty-eight million, eight hundred eighty-one thousand, one hundred fifty-six".