28626491 has 4 divisors (see below), whose sum is σ = 28648032. Its totient is φ = 28604952.

The previous prime is 28626473. The next prime is 28626497. The reversal of 28626491 is 19462682.

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

It is a cyclic number.

It is not a de Polignac number, because 28626491 - 2⁶ = 28626427 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28626497) 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, 8636 + ... + 11481.

It is an arithmetic number, because the mean of its divisors is an integer number (7162008).

Almost surely, 2^28626491 is an apocalyptic number.

28626491 is a deficient number, since it is larger than the sum of its proper divisors (21541).

28626491 is a wasteful number, since it uses less digits than its factorization.

28626491 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21540.

The product of its digits is 41472, while the sum is 38.

The square root of 28626491 is about 5350.3729776531. The cubic root of 28626491 is about 305.9069697405.

The spelling of 28626491 in words is "twenty-eight million, six hundred twenty-six thousand, four hundred ninety-one".