28997623 has 2 divisors, whose sum is σ = 28997624. Its totient is φ = 28997622.

The previous prime is 28997581. The next prime is 28997653. The reversal of 28997623 is 32679982.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-28997623 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (28997653) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14498811 + 14498812.

It is an arithmetic number, because the mean of its divisors is an integer number (14498812).

Almost surely, 2^28997623 is an apocalyptic number.

28997623 is a deficient number, since it is larger than the sum of its proper divisors (1).

28997623 is an equidigital number, since it uses as much as digits as its factorization.

28997623 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 326592, while the sum is 46.

The square root of 28997623 is about 5384.9441037025. The cubic root of 28997623 is about 307.2232882046.

The spelling of 28997623 in words is "twenty-eight million, nine hundred ninety-seven thousand, six hundred twenty-three".