28531711 has 8 divisors (see below), whose sum is σ = 32343920. Its totient is φ = 24950592.

The previous prime is 28531703. The next prime is 28531717. The reversal of 28531711 is 11713582.

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 28531711 - 2³ = 28531703 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 28531711.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28531717) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 57510 + ... + 58003.

It is an arithmetic number, because the mean of its divisors is an integer number (4042990).

Almost surely, 2^28531711 is an apocalyptic number.

28531711 is a deficient number, since it is larger than the sum of its proper divisors (3812209).

28531711 is a wasteful number, since it uses less digits than its factorization.

28531711 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 115545.

The product of its digits is 1680, while the sum is 28.

The square root of 28531711 is about 5341.5083075850. The cubic root of 28531711 is about 305.5689853614.

The spelling of 28531711 in words is "twenty-eight million, five hundred thirty-one thousand, seven hundred eleven".