28626181 has 8 divisors (see below), whose sum is σ = 30551040. Its totient is φ = 26728128.

The previous prime is 28626163. The next prime is 28626193. The reversal of 28626181 is 18162682.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 28626181 - 2⁹ = 28625669 is a prime.

It is a super-2 number, since 2×28626181² = 1638916477289522, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28626781) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4471 + ... + 8788.

It is an arithmetic number, because the mean of its divisors is an integer number (3818880).

Almost surely, 2^28626181 is an apocalyptic number.

It is an amenable number.

28626181 is a deficient number, since it is larger than the sum of its proper divisors (1924859).

28626181 is a wasteful number, since it uses less digits than its factorization.

28626181 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13403.

The product of its digits is 9216, while the sum is 34.

The square root of 28626181 is about 5350.3440076317. The cubic root of 28626181 is about 305.9058655010.

The spelling of 28626181 in words is "twenty-eight million, six hundred twenty-six thousand, one hundred eighty-one".