28578711 has 12 divisors (see below), whose sum is σ = 44326392. Its totient is φ = 16330608.

The previous prime is 28578709. The next prime is 28578721. The reversal of 28578711 is 11787582.

It is not a de Polignac number, because 28578711 - 2¹ = 28578709 is a prime.

It is a Smith number, since the sum of its digits (39) coincides with the sum of the digits of its prime factors.

It is a self number, because there is not a number n which added to its sum of digits gives 28578711.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28578721) 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 11 ways as a sum of consecutive naturals, for example, 97060 + ... + 97353.

It is an arithmetic number, because the mean of its divisors is an integer number (3693866).

Almost surely, 2^28578711 is an apocalyptic number.

28578711 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

28578711 is a deficient number, since it is larger than the sum of its proper divisors (15747681).

28578711 is a wasteful number, since it uses less digits than its factorization.

28578711 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 194430 (or 194423 counting only the distinct ones).

The product of its digits is 31360, while the sum is 39.

The square root of 28578711 is about 5345.9060036630. The cubic root of 28578711 is about 305.7366802178.

The spelling of 28578711 in words is "twenty-eight million, five hundred seventy-eight thousand, seven hundred eleven".