28003261 has 16 divisors (see below), whose sum is σ = 33965568. Its totient is φ = 22737600.

The previous prime is 28003249. The next prime is 28003271. The reversal of 28003261 is 16230082.

It is a cyclic number.

It is not a de Polignac number, because 28003261 - 2⁹ = 28002749 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28003231) 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, 1275 + ... + 7591.

It is an arithmetic number, because the mean of its divisors is an integer number (2122848).

Almost surely, 2^28003261 is an apocalyptic number.

It is an amenable number.

28003261 is a deficient number, since it is larger than the sum of its proper divisors (5962307).

28003261 is a wasteful number, since it uses less digits than its factorization.

28003261 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6372.

The product of its (nonzero) digits is 576, while the sum is 22.

The square root of 28003261 is about 5291.8107486946. The cubic root of 28003261 is about 303.6706852021.

The spelling of 28003261 in words is "twenty-eight million, three thousand, two hundred sixty-one".