28421131 has 8 divisors (see below), whose sum is σ = 30949200. Its totient is φ = 25996320.

The previous prime is 28421117. The next prime is 28421149. The reversal of 28421131 is 13112482.

It is a happy number.

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 28421131 - 2⁹ = 28420619 is a prime.

It is a super-2 number, since 2×28421131² = 1615521374638322, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28421101) 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, 25240 + ... + 26341.

It is an arithmetic number, because the mean of its divisors is an integer number (3868650).

Almost surely, 2^28421131 is an apocalyptic number.

28421131 is a deficient number, since it is larger than the sum of its proper divisors (2528069).

28421131 is a wasteful number, since it uses less digits than its factorization.

28421131 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 51629.

The product of its digits is 384, while the sum is 22.

The square root of 28421131 is about 5331.1472498891. The cubic root of 28421131 is about 305.1737109529.

The spelling of 28421131 in words is "twenty-eight million, four hundred twenty-one thousand, one hundred thirty-one".