28382157 has 14 divisors (see below), whose sum is σ = 42554862. Its totient is φ = 18920952.

The previous prime is 28382149. The next prime is 28382177. The reversal of 28382157 is 75128382.

It can be written as a sum of positive squares in only one way, i.e., 14699556 + 13682601 = 3834^2 + 3699^2 .

It is not a de Polignac number, because 28382157 - 2³ = 28382149 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28382177) 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 13 ways as a sum of consecutive naturals, for example, 18738 + ... + 20195.

It is an arithmetic number, because the mean of its divisors is an integer number (3039633).

Almost surely, 2^28382157 is an apocalyptic number.

28382157 is a gapful number since it is divisible by the number (27) formed by its first and last digit.

It is an amenable number.

28382157 is a deficient number, since it is larger than the sum of its proper divisors (14172705).

28382157 is an frugal number, since it uses more digits than its factorization.

28382157 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 38951 (or 38936 counting only the distinct ones).

The product of its digits is 26880, while the sum is 36.

The square root of 28382157 is about 5327.4906851162. The cubic root of 28382157 is about 305.0341518687.

The spelling of 28382157 in words is "twenty-eight million, three hundred eighty-two thousand, one hundred fifty-seven".