26221728 has 48 divisors (see below), whose sum is σ = 74130336. Its totient is φ = 8067840.

The previous prime is 26221717. The next prime is 26221733. The reversal of 26221728 is 82712262.

It is a tau number, because it is divible by the number of its divisors (48).

It is a junction number, because it is equal to n+sod(n) for n = 26221695 and 26221704.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 9258 + ... + 11753.

It is an arithmetic number, because the mean of its divisors is an integer number (1544382).

Almost surely, 2^26221728 is an apocalyptic number.

It is an amenable number.

26221728 is an abundant number, since it is smaller than the sum of its proper divisors (47908608).

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

26221728 is a wasteful number, since it uses less digits than its factorization.

26221728 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21037 (or 21029 counting only the distinct ones).

The product of its digits is 5376, while the sum is 30.

The square root of 26221728 is about 5120.7155749954. The cubic root of 26221728 is about 297.0893630808.

The spelling of 26221728 in words is "twenty-six million, two hundred twenty-one thousand, seven hundred twenty-eight".