28690423 has 2 divisors, whose sum is σ = 28690424. Its totient is φ = 28690422.

The previous prime is 28690421. The next prime is 28690439. The reversal of 28690423 is 32409682.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 28690423 - 2¹ = 28690421 is a prime.

Together with 28690421, it forms a pair of twin primes.

It is equal to p_1781728 and since 28690423 and 1781728 have the same sum of digits, it is a Honaker prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (28690421) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14345211 + 14345212.

It is an arithmetic number, because the mean of its divisors is an integer number (14345212).

Almost surely, 2^28690423 is an apocalyptic number.

28690423 is a deficient number, since it is larger than the sum of its proper divisors (1).

28690423 is an equidigital number, since it uses as much as digits as its factorization.

28690423 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 20736, while the sum is 34.

The square root of 28690423 is about 5356.3441823692. The cubic root of 28690423 is about 306.1345293956.

It can be divided in two parts, 286 and 90423, that added together give a palindrome (90709).

The spelling of 28690423 in words is "twenty-eight million, six hundred ninety thousand, four hundred twenty-three".