28260421 has 16 divisors (see below), whose sum is σ = 33030144. Its totient is φ = 23680944.

The previous prime is 28260389. The next prime is 28260431. The reversal of 28260421 is 12406282.

It is a happy number.

It is not a de Polignac number, because 28260421 - 2⁵ = 28260389 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28260431) 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 15 ways as a sum of consecutive naturals, for example, 73596 + ... + 73978.

It is an arithmetic number, because the mean of its divisors is an integer number (2064384).

Almost surely, 2^28260421 is an apocalyptic number.

It is an amenable number.

28260421 is a deficient number, since it is larger than the sum of its proper divisors (4769723).

28260421 is a wasteful number, since it uses less digits than its factorization.

28260421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 600.

The product of its (nonzero) digits is 1536, while the sum is 25.

The square root of 28260421 is about 5316.0531411941. The cubic root of 28260421 is about 304.5974120388.

The spelling of 28260421 in words is "twenty-eight million, two hundred sixty thousand, four hundred twenty-one".