28731707 has 2 divisors, whose sum is σ = 28731708. Its totient is φ = 28731706.

The previous prime is 28731701. The next prime is 28731709. The reversal of 28731707 is 70713782.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-28731707 is a prime.

Together with 28731709, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (28731701) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14365853 + 14365854.

It is an arithmetic number, because the mean of its divisors is an integer number (14365854).

Almost surely, 2^28731707 is an apocalyptic number.

28731707 is a deficient number, since it is larger than the sum of its proper divisors (1).

28731707 is an equidigital number, since it uses as much as digits as its factorization.

28731707 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 16464, while the sum is 35.

The square root of 28731707 is about 5360.1965449039. The cubic root of 28731707 is about 306.2812961492.

It can be divided in two parts, 287 and 31707, that multiplied together give a palindrome (9099909).

The spelling of 28731707 in words is "twenty-eight million, seven hundred thirty-one thousand, seven hundred seven".