26928721 has 8 divisors (see below), whose sum is σ = 27662400. Its totient is φ = 26204400.

The previous prime is 26928709. The next prime is 26928773. The reversal of 26928721 is 12782962.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 26928721 - 2⁷ = 26928593 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (26928701) 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, 3700 + ... + 8218.

It is an arithmetic number, because the mean of its divisors is an integer number (3457800).

Almost surely, 2^26928721 is an apocalyptic number.

It is an amenable number.

26928721 is a deficient number, since it is larger than the sum of its proper divisors (733679).

26928721 is a wasteful number, since it uses less digits than its factorization.

26928721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4679.

The product of its digits is 24192, while the sum is 37.

The square root of 26928721 is about 5189.2890649876. The cubic root of 26928721 is about 299.7357710489.

The spelling of 26928721 in words is "twenty-six million, nine hundred twenty-eight thousand, seven hundred twenty-one".