28366957 has 4 divisors (see below), whose sum is σ = 29058876. Its totient is φ = 27675040.

The previous prime is 28366937. The next prime is 28366963. The reversal of 28366957 is 75966382.

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

It can be written as a sum of positive squares in 2 ways, for example, as 2499561 + 25867396 = 1581^2 + 5086^2 .

It is a cyclic number.

It is not a de Polignac number, because 28366957 - 2¹⁹ = 27842669 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28366907) 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 3 ways as a sum of consecutive naturals, for example, 345898 + ... + 345979.

It is an arithmetic number, because the mean of its divisors is an integer number (7264719).

Almost surely, 2^28366957 is an apocalyptic number.

It is an amenable number.

28366957 is a deficient number, since it is larger than the sum of its proper divisors (691919).

28366957 is an equidigital number, since it uses as much as digits as its factorization.

28366957 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 691918.

The product of its digits is 544320, while the sum is 46.

The square root of 28366957 is about 5326.0639312723. The cubic root of 28366957 is about 304.9796886949.

The spelling of 28366957 in words is "twenty-eight million, three hundred sixty-six thousand, nine hundred fifty-seven".