28691136 has 42 divisors (see below), whose sum is σ = 82239612. Its totient is φ = 9563520.

The previous prime is 28691123. The next prime is 28691137. The reversal of 28691136 is 63119682.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a nude number because it is divisible by every one of its digits.

It is a self number, because there is not a number n which added to its sum of digits gives 28691136.

It is not an unprimeable number, because it can be changed into a prime (28691137) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 24330 + ... + 25481.

It is an arithmetic number, because the mean of its divisors is an integer number (1958086).

Almost surely, 2^28691136 is an apocalyptic number.

It is an amenable number.

28691136 is an abundant number, since it is smaller than the sum of its proper divisors (53548476).

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

28691136 is a wasteful number, since it uses less digits than its factorization.

28691136 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 49829 (or 49816 counting only the distinct ones).

The product of its digits is 15552, while the sum is 36.

The square root of 28691136 is about 5356.4107385450. The cubic root of 28691136 is about 306.1370653418.

It can be divided in two parts, 2869 and 1136, that added together give a triangular number (4005 = T₈₉).

The spelling of 28691136 in words is "twenty-eight million, six hundred ninety-one thousand, one hundred thirty-six".