28157323 has 2 divisors, whose sum is σ = 28157324. Its totient is φ = 28157322.

The previous prime is 28157309. The next prime is 28157357. The reversal of 28157323 is 32375182.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 28157323 - 2¹³ = 28149131 is a prime.

It is not a weakly prime, because it can be changed into another prime (28157383) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14078661 + 14078662.

It is an arithmetic number, because the mean of its divisors is an integer number (14078662).

Almost surely, 2^28157323 is an apocalyptic number.

28157323 is a deficient number, since it is larger than the sum of its proper divisors (1).

28157323 is an equidigital number, since it uses as much as digits as its factorization.

28157323 is an evil number, because the sum of its binary digits is even.

The product of its digits is 10080, while the sum is 31.

The square root of 28157323 is about 5306.3474254896. The cubic root of 28157323 is about 304.2265559269.

It can be divided in two parts, 28 and 157323, that multiplied together give a palindrome (4405044).

The spelling of 28157323 in words is "twenty-eight million, one hundred fifty-seven thousand, three hundred twenty-three".