28023040 has 36 divisors (see below), whose sum is σ = 67127004. Its totient is φ = 11208704.

The previous prime is 28023031. The next prime is 28023071. The reversal of 28023040 is 4032082.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 15745024 + 12278016 = 3968^2 + 3504^2 .

It is a junction number, because it is equal to n+sod(n) for n = 28022999 and 28023017.

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, 9667 + ... + 12226.

It is an arithmetic number, because the mean of its divisors is an integer number (1864639).

Almost surely, 2^28023040 is an apocalyptic number.

28023040 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

28023040 is an abundant number, since it is smaller than the sum of its proper divisors (39103964).

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

28023040 is an equidigital number, since it uses as much as digits as its factorization.

28023040 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21914 (or 21900 counting only the distinct ones).

The product of its (nonzero) digits is 384, while the sum is 19.

The square root of 28023040 is about 5293.6792498224. The cubic root of 28023040 is about 303.7421636505.

The spelling of 28023040 in words is "twenty-eight million, twenty-three thousand, forty".