28706731 has 2 divisors, whose sum is σ = 28706732. Its totient is φ = 28706730.

The previous prime is 28706729. The next prime is 28706747. The reversal of 28706731 is 13760782.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 28706731 - 2¹ = 28706729 is a prime.

It is a super-2 number, since 2×28706731² = 1648152809412722, which contains 22 as substring.

Together with 28706729, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (28706771) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14353365 + 14353366.

It is an arithmetic number, because the mean of its divisors is an integer number (14353366).

Almost surely, 2^28706731 is an apocalyptic number.

28706731 is a deficient number, since it is larger than the sum of its proper divisors (1).

28706731 is an equidigital number, since it uses as much as digits as its factorization.

28706731 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 14112, while the sum is 34.

The square root of 28706731 is about 5357.8662730606. The cubic root of 28706731 is about 306.1925219910.

The spelling of 28706731 in words is "twenty-eight million, seven hundred six thousand, seven hundred thirty-one".