28355567 has 2 divisors, whose sum is σ = 28355568. Its totient is φ = 28355566.

The previous prime is 28355563. The next prime is 28355597. The reversal of 28355567 is 76555382.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 28355567 - 2² = 28355563 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (28355563) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14177783 + 14177784.

It is an arithmetic number, because the mean of its divisors is an integer number (14177784).

Almost surely, 2^28355567 is an apocalyptic number.

28355567 is a deficient number, since it is larger than the sum of its proper divisors (1).

28355567 is an equidigital number, since it uses as much as digits as its factorization.

28355567 is an evil number, because the sum of its binary digits is even.

The product of its digits is 252000, while the sum is 41.

The square root of 28355567 is about 5324.9945539878. The cubic root of 28355567 is about 304.9388643926.

It can be divided in two parts, 28355 and 567, that multiplied together give a triangular number (16077285 = T₅₆₇₀).

The spelling of 28355567 in words is "twenty-eight million, three hundred fifty-five thousand, five hundred sixty-seven".