28215727 has 2 divisors, whose sum is σ = 28215728. Its totient is φ = 28215726.

The previous prime is 28215713. The next prime is 28215731. The reversal of 28215727 is 72751282.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 28215727 - 2⁷ = 28215599 is a prime.

It is a super-2 number, since 2×28215727² = 1592254500277058, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 28215692 and 28215701.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (28215757) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14107863 + 14107864.

It is an arithmetic number, because the mean of its divisors is an integer number (14107864).

Almost surely, 2^28215727 is an apocalyptic number.

28215727 is a deficient number, since it is larger than the sum of its proper divisors (1).

28215727 is an equidigital number, since it uses as much as digits as its factorization.

28215727 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 15680, while the sum is 34.

The square root of 28215727 is about 5311.8477952592. The cubic root of 28215727 is about 304.4367531944.

The spelling of 28215727 in words is "twenty-eight million, two hundred fifteen thousand, seven hundred twenty-seven".