28055424 has 32 divisors (see below), whose sum is σ = 74523240. Its totient is φ = 9351680.

The previous prime is 28055413. The next prime is 28055431. The reversal of 28055424 is 42455082.

It is a tau number, because it is divible by the number of its divisors (32).

It is a junction number, because it is equal to n+sod(n) for n = 28055391 and 28055400.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 36147 + ... + 36914.

Almost surely, 2^28055424 is an apocalyptic number.

28055424 is a gapful number since it is divisible by the number (24) formed by its first and last digit.

It is an amenable number.

28055424 is an abundant number, since it is smaller than the sum of its proper divisors (46467816).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

28055424 is an equidigital number, since it uses as much as digits as its factorization.

28055424 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 73078 (or 73066 counting only the distinct ones).

The product of its (nonzero) digits is 12800, while the sum is 30.

The square root of 28055424 is about 5296.7371088246. The cubic root of 28055424 is about 303.8591221676.

The spelling of 28055424 in words is "twenty-eight million, fifty-five thousand, four hundred twenty-four".