28830881 has 16 divisors (see below), whose sum is σ = 30862080. Its totient is φ = 26893440.

The previous prime is 28830869. The next prime is 28830889. The reversal of 28830881 is 18803882.

It is a cyclic number.

It is not a de Polignac number, because 28830881 - 2⁶ = 28830817 is a prime.

It is a super-2 number, since 2×28830881² = 1662439398472322, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (28830889) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 102461 + ... + 102741.

It is an arithmetic number, because the mean of its divisors is an integer number (1928880).

Almost surely, 2^28830881 is an apocalyptic number.

It is an amenable number.

28830881 is a deficient number, since it is larger than the sum of its proper divisors (2031199).

28830881 is a wasteful number, since it uses less digits than its factorization.

28830881 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 424.

The product of its (nonzero) digits is 24576, while the sum is 38.

The square root of 28830881 is about 5369.4395424476. The cubic root of 28830881 is about 306.6332912376.

The spelling of 28830881 in words is "twenty-eight million, eight hundred thirty thousand, eight hundred eighty-one".