28263551 has 2 divisors, whose sum is σ = 28263552. Its totient is φ = 28263550.

The previous prime is 28263539. The next prime is 28263553. The reversal of 28263551 is 15536282.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-28263551 is a prime.

It is a Sophie Germain prime.

Together with 28263553, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (28263553) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14131775 + 14131776.

It is an arithmetic number, because the mean of its divisors is an integer number (14131776).

Almost surely, 2^28263551 is an apocalyptic number.

28263551 is a deficient number, since it is larger than the sum of its proper divisors (1).

28263551 is an equidigital number, since it uses as much as digits as its factorization.

28263551 is an evil number, because the sum of its binary digits is even.

The product of its digits is 14400, while the sum is 32.

The square root of 28263551 is about 5316.3475243818. The cubic root of 28263551 is about 304.6086569138.

The spelling of 28263551 in words is "twenty-eight million, two hundred sixty-three thousand, five hundred fifty-one".