28555091 has 2 divisors, whose sum is σ = 28555092. Its totient is φ = 28555090.

The previous prime is 28555069. The next prime is 28555097. The reversal of 28555091 is 19055582.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-28555091 is a prime.

It is not a weakly prime, because it can be changed into another prime (28555097) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14277545 + 14277546.

It is an arithmetic number, because the mean of its divisors is an integer number (14277546).

Almost surely, 2^28555091 is an apocalyptic number.

28555091 is a deficient number, since it is larger than the sum of its proper divisors (1).

28555091 is an equidigital number, since it uses as much as digits as its factorization.

28555091 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 18000, while the sum is 35.

The square root of 28555091 is about 5343.6963798479. The cubic root of 28555091 is about 305.6524276332.

The spelling of 28555091 in words is "twenty-eight million, five hundred fifty-five thousand, ninety-one".