28691123 has 2 divisors, whose sum is σ = 28691124. Its totient is φ = 28691122.

The previous prime is 28691107. The next prime is 28691137. The reversal of 28691123 is 32119682.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 28691123 - 2⁴ = 28691107 is a prime.

It is a super-2 number, since 2×28691123² = 1646361078002258, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 28691123.

It is not a weakly prime, because it can be changed into another prime (28691153) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14345561 + 14345562.

It is an arithmetic number, because the mean of its divisors is an integer number (14345562).

Almost surely, 2^28691123 is an apocalyptic number.

28691123 is a deficient number, since it is larger than the sum of its proper divisors (1).

28691123 is an equidigital number, since it uses as much as digits as its factorization.

28691123 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 5184, while the sum is 32.

The square root of 28691123 is about 5356.4095250457. The cubic root of 28691123 is about 306.1370191048.

The spelling of 28691123 in words is "twenty-eight million, six hundred ninety-one thousand, one hundred twenty-three".