28881801 has 24 divisors (see below), whose sum is σ = 46382336. Its totient is φ = 17197920.

The previous prime is 28881791. The next prime is 28881803. The reversal of 28881801 is 10818882.

It is a happy number.

It is not a de Polignac number, because 28881801 - 2⁶ = 28881737 is a prime.

It is a hoax number, since the sum of its digits (36) coincides with the sum of the digits of its distinct prime factors.

It is not an unprimeable number, because it can be changed into a prime (28881803) by changing a digit.

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 23 ways as a sum of consecutive naturals, for example, 355 + ... + 7608.

Almost surely, 2^28881801 is an apocalyptic number.

It is an amenable number.

28881801 is a deficient number, since it is larger than the sum of its proper divisors (17500535).

28881801 is a wasteful number, since it uses less digits than its factorization.

28881801 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8013 (or 8010 counting only the distinct ones).

The product of its (nonzero) digits is 8192, while the sum is 36.

The square root of 28881801 is about 5374.1791001045. The cubic root of 28881801 is about 306.8137063979.

The spelling of 28881801 in words is "twenty-eight million, eight hundred eighty-one thousand, eight hundred one".