28849881 has 4 divisors (see below), whose sum is σ = 38466512. Its totient is φ = 19233252.

The previous prime is 28849829. The next prime is 28849883. The reversal of 28849881 is 18894882.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 28849881 - 2⁶ = 28849817 is a prime.

It is a super-2 number, since 2×28849881² = 1664631267428322, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 28849881.

It is not an unprimeable number, because it can be changed into a prime (28849883) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4808311 + ... + 4808316.

It is an arithmetic number, because the mean of its divisors is an integer number (9616628).

Almost surely, 2^28849881 is an apocalyptic number.

It is an amenable number.

28849881 is a deficient number, since it is larger than the sum of its proper divisors (9616631).

28849881 is an equidigital number, since it uses as much as digits as its factorization.

28849881 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9616630.

The product of its digits is 294912, while the sum is 48.

The square root of 28849881 is about 5371.2085232283. The cubic root of 28849881 is about 306.7006351524.

The spelling of 28849881 in words is "twenty-eight million, eight hundred forty-nine thousand, eight hundred eighty-one".