28601181 has 40 divisors (see below), whose sum is σ = 49569344. Its totient is φ = 16096320.

The previous prime is 28601179. The next prime is 28601201. The reversal of 28601181 is 18110682.

It is not a de Polignac number, because 28601181 - 2¹ = 28601179 is a prime.

It is a super-2 number, since 2×28601181² = 1636055109189522, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28601141) by changing a digit.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 41046 + ... + 41736.

Almost surely, 2^28601181 is an apocalyptic number.

28601181 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

It is an amenable number.

28601181 is a deficient number, since it is larger than the sum of its proper divisors (20968163).

28601181 is an equidigital number, since it uses as much as digits as its factorization.

28601181 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 783 (or 774 counting only the distinct ones).

The product of its (nonzero) digits is 768, while the sum is 27.

The square root of 28601181 is about 5348.0071989480. The cubic root of 28601181 is about 305.8167876738.

It can be divided in two parts, 28601 and 181, that added together give a palindrome (28782).

The spelling of 28601181 in words is "twenty-eight million, six hundred one thousand, one hundred eighty-one".