28670731 has 2 divisors, whose sum is σ = 28670732. Its totient is φ = 28670730.

The previous prime is 28670713. The next prime is 28670777. The reversal of 28670731 is 13707682.

Together with previous prime (28670713) it forms an Ormiston pair, because they use the same digits, order apart.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 28670731 - 2¹¹ = 28668683 is a prime.

It is a super-2 number, since 2×28670731² = 1644021632148722, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (28650731) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14335365 + 14335366.

It is an arithmetic number, because the mean of its divisors is an integer number (14335366).

Almost surely, 2^28670731 is an apocalyptic number.

28670731 is a deficient number, since it is larger than the sum of its proper divisors (1).

28670731 is an equidigital number, since it uses as much as digits as its factorization.

28670731 is an odious number, because the sum of its binary digits is odd.

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

The square root of 28670731 is about 5354.5056727956. The cubic root of 28670731 is about 306.0644737200.

It can be divided in two parts, 286 and 70731, that added together give a palindrome (71017).

The spelling of 28670731 in words is "twenty-eight million, six hundred seventy thousand, seven hundred thirty-one".