28272731 has 2 divisors, whose sum is σ = 28272732. Its totient is φ = 28272730.

The previous prime is 28272721. The next prime is 28272737. The reversal of 28272731 is 13727282.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 28272731 - 2⁶ = 28272667 is a prime.

It is a super-2 number, since 2×28272731² = 1598694636396722, which contains 22 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (28272737) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14136365 + 14136366.

It is an arithmetic number, because the mean of its divisors is an integer number (14136366).

Almost surely, 2^28272731 is an apocalyptic number.

28272731 is a deficient number, since it is larger than the sum of its proper divisors (1).

28272731 is an equidigital number, since it uses as much as digits as its factorization.

28272731 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 9408, while the sum is 32.

The square root of 28272731 is about 5317.2108289967. The cubic root of 28272731 is about 304.6416323030.

The spelling of 28272731 in words is "twenty-eight million, two hundred seventy-two thousand, seven hundred thirty-one".