28157311 has 12 divisors (see below), whose sum is σ = 35274792. Its totient is φ = 22277808.

The previous prime is 28157309. The next prime is 28157323. The reversal of 28157311 is 11375182.

It is not a de Polignac number, because 28157311 - 2¹ = 28157309 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 28157311.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28157711) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 21465 + ... + 22738.

It is an arithmetic number, because the mean of its divisors is an integer number (2939566).

Almost surely, 2^28157311 is an apocalyptic number.

28157311 is a deficient number, since it is larger than the sum of its proper divisors (7117481).

28157311 is a wasteful number, since it uses less digits than its factorization.

28157311 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 44230 (or 44223 counting only the distinct ones).

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

The square root of 28157311 is about 5306.3462947682. The cubic root of 28157311 is about 304.2265127087.

The spelling of 28157311 in words is "twenty-eight million, one hundred fifty-seven thousand, three hundred eleven".