28723867 has 2 divisors, whose sum is σ = 28723868. Its totient is φ = 28723866.

The previous prime is 28723853. The next prime is 28723873. The reversal of 28723867 is 76832782.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 28723867 - 2¹⁵ = 28691099 is a prime.

It is not a weakly prime, because it can be changed into another prime (28723837) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14361933 + 14361934.

It is an arithmetic number, because the mean of its divisors is an integer number (14361934).

Almost surely, 2^28723867 is an apocalyptic number.

28723867 is a deficient number, since it is larger than the sum of its proper divisors (1).

28723867 is an equidigital number, since it uses as much as digits as its factorization.

28723867 is an evil number, because the sum of its binary digits is even.

The product of its digits is 225792, while the sum is 43.

The square root of 28723867 is about 5359.4651785416. The cubic root of 28723867 is about 306.2534353634.

The spelling of 28723867 in words is "twenty-eight million, seven hundred twenty-three thousand, eight hundred sixty-seven".