28421953 has 8 divisors (see below), whose sum is σ = 32542272.
Its totient is φ = 24316656.
The previous prime is 28421927. The next prime is 28421959. The reversal of 28421953 is 35912482.
It is a sphenic number, since it is the product of 3 distinct primes.
It is not a de Polignac number, because 28421953 - 213 = 28413761 is a prime.
It is not an unprimeable number, because it can be changed into a prime (28421959) 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 7 ways as a sum of consecutive naturals, for example, 651 + ... + 7567.
It is an arithmetic number, because the mean of its divisors is an integer number (4067784).
Almost surely, 228421953 is an apocalyptic number.
It is an amenable number.
28421953 is a deficient number, since it is larger than the sum of its proper divisors (4120319).
28421953 is an equidigital number, since it uses as much as digits as its factorization.
28421953 is an odious number, because the sum of its binary digits is odd.
The sum of its prime factors is 7511.
The product of its digits is 17280, while the sum is 34.
The square root of 28421953 is about 5331.2243434318.
The cubic root of 28421953 is about 305.1766530171.
The spelling of 28421953 in words is "twenty-eight million, four hundred twenty-one thousand, nine hundred fifty-three".