28726427 has 4 divisors (see below), whose sum is σ = 28753440. Its totient is φ = 28699416.

The previous prime is 28726421. The next prime is 28726459. The reversal of 28726427 is 72462782.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-28726427 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28726421) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 11843 + ... + 14060.

It is an arithmetic number, because the mean of its divisors is an integer number (7188360).

Almost surely, 2^28726427 is an apocalyptic number.

28726427 is a deficient number, since it is larger than the sum of its proper divisors (27013).

28726427 is a wasteful number, since it uses less digits than its factorization.

28726427 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27012.

The product of its digits is 75264, while the sum is 38.

The square root of 28726427 is about 5359.7040030211. The cubic root of 28726427 is about 306.2625333202.

The spelling of 28726427 in words is "twenty-eight million, seven hundred twenty-six thousand, four hundred twenty-seven".