28508423 has 2 divisors, whose sum is σ = 28508424. Its totient is φ = 28508422.

The previous prime is 28508419. The next prime is 28508429. The reversal of 28508423 is 32480582.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 28508423 - 2² = 28508419 is a prime.

It is a Sophie Germain prime.

It is a self number, because there is not a number n which added to its sum of digits gives 28508423.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (28508429) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14254211 + 14254212.

It is an arithmetic number, because the mean of its divisors is an integer number (14254212).

Almost surely, 2^28508423 is an apocalyptic number.

28508423 is a deficient number, since it is larger than the sum of its proper divisors (1).

28508423 is an equidigital number, since it uses as much as digits as its factorization.

28508423 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 15360, while the sum is 32.

The square root of 28508423 is about 5339.3279539657. The cubic root of 28508423 is about 305.4858261063.

The spelling of 28508423 in words is "twenty-eight million, five hundred eight thousand, four hundred twenty-three".