28421523 has 28 divisors (see below), whose sum is σ = 45906000. Its totient is φ = 17484336.

The previous prime is 28421443. The next prime is 28421531. The reversal of 28421523 is 32512482.

It is not a de Polignac number, because 28421523 - 2⁹ = 28421011 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is not an unprimeable number, because it can be changed into a prime (28421623) by changing a digit.

It is a polite number, since it can be written in 27 ways as a sum of consecutive naturals, for example, 7978 + ... + 10976.

It is an arithmetic number, because the mean of its divisors is an integer number (1639500).

Almost surely, 2^28421523 is an apocalyptic number.

28421523 is a deficient number, since it is larger than the sum of its proper divisors (17484477).

28421523 is an equidigital number, since it uses as much as digits as its factorization.

28421523 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3030 (or 3015 counting only the distinct ones).

The product of its digits is 3840, while the sum is 27.

The square root of 28421523 is about 5331.1840148320. The cubic root of 28421523 is about 305.1751139881.

The spelling of 28421523 in words is "twenty-eight million, four hundred twenty-one thousand, five hundred twenty-three".