28623979 has 2 divisors, whose sum is σ = 28623980. Its totient is φ = 28623978.

The previous prime is 28623949. The next prime is 28623989. The reversal of 28623979 is 97932682.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 28623979 - 2⁷ = 28623851 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (28623919) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14311989 + 14311990.

It is an arithmetic number, because the mean of its divisors is an integer number (14311990).

Almost surely, 2^28623979 is an apocalyptic number.

28623979 is a deficient number, since it is larger than the sum of its proper divisors (1).

28623979 is an equidigital number, since it uses as much as digits as its factorization.

28623979 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 28623979 is about 5350.1382225135. The cubic root of 28623979 is about 305.8980216093.

The spelling of 28623979 in words is "twenty-eight million, six hundred twenty-three thousand, nine hundred seventy-nine".