28904923 has 2 divisors, whose sum is σ = 28904924. Its totient is φ = 28904922.

The previous prime is 28904921. The next prime is 28904963. The reversal of 28904923 is 32940982.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 28904923 - 2¹ = 28904921 is a prime.

It is a super-3 number, since 3×28904923³ (a number of 23 digits) contains 333 as substring.

Together with 28904921, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (28904921) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14452461 + 14452462.

It is an arithmetic number, because the mean of its divisors is an integer number (14452462).

Almost surely, 2^28904923 is an apocalyptic number.

28904923 is a deficient number, since it is larger than the sum of its proper divisors (1).

28904923 is an equidigital number, since it uses as much as digits as its factorization.

28904923 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 31104, while the sum is 37.

The square root of 28904923 is about 5376.3298819920. The cubic root of 28904923 is about 306.8955601834.

The spelling of 28904923 in words is "twenty-eight million, nine hundred four thousand, nine hundred twenty-three".