28961286 has 16 divisors (see below), whose sum is σ = 58787904. Its totient is φ = 9509544.

The previous prime is 28961281. The next prime is 28961287. The reversal of 28961286 is 68216982.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28961281) 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 7 ways as a sum of consecutive naturals, for example, 35620 + ... + 36423.

It is an arithmetic number, because the mean of its divisors is an integer number (3674244).

Almost surely, 2^28961286 is an apocalyptic number.

28961286 is an abundant number, since it is smaller than the sum of its proper divisors (29826618).

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

28961286 is a wasteful number, since it uses less digits than its factorization.

28961286 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 72115.

The product of its digits is 82944, while the sum is 42.

The square root of 28961286 is about 5381.5691020371. The cubic root of 28961286 is about 307.0949071197.

The spelling of 28961286 in words is "twenty-eight million, nine hundred sixty-one thousand, two hundred eighty-six".