28013591 has 2 divisors, whose sum is σ = 28013592. Its totient is φ = 28013590.

The previous prime is 28013567. The next prime is 28013611. The reversal of 28013591 is 19531082.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 28013591 - 2⁶ = 28013527 is a prime.

It is a super-2 number, since 2×28013591² = 1569522561430562, which contains 22 as substring.

It is a Sophie Germain prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (28013561) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14006795 + 14006796.

It is an arithmetic number, because the mean of its divisors is an integer number (14006796).

Almost surely, 2^28013591 is an apocalyptic number.

28013591 is a deficient number, since it is larger than the sum of its proper divisors (1).

28013591 is an equidigital number, since it uses as much as digits as its factorization.

28013591 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2160, while the sum is 29.

The square root of 28013591 is about 5292.7866951163. The cubic root of 28013591 is about 303.7080205270.

The spelling of 28013591 in words is "twenty-eight million, thirteen thousand, five hundred ninety-one".