28761156 has 60 divisors (see below), whose sum is σ = 77805420. Its totient is φ = 9253440.

The previous prime is 28761137. The next prime is 28761163. The reversal of 28761156 is 65116782.

It can be written as a sum of positive squares in 2 ways, for example, as 22410756 + 6350400 = 4734^2 + 2520^2 .

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

It is a self number, because there is not a number n which added to its sum of digits gives 28761156.

It is an unprimeable number.

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 19 ways as a sum of consecutive naturals, for example, 7866 + ... + 10926.

It is an arithmetic number, because the mean of its divisors is an integer number (1296757).

Almost surely, 2^28761156 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 28761156, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (38902710).

28761156 is an abundant number, since it is smaller than the sum of its proper divisors (49044264).

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

28761156 is a wasteful number, since it uses less digits than its factorization.

28761156 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3106 (or 3095 counting only the distinct ones).

The product of its digits is 20160, while the sum is 36.

The square root of 28761156 is about 5362.9428488471. The cubic root of 28761156 is about 306.3859029752.

The spelling of 28761156 in words is "twenty-eight million, seven hundred sixty-one thousand, one hundred fifty-six".