28071729 has 12 divisors (see below), whose sum is σ = 46340736. Its totient is φ = 16040952.

The previous prime is 28071713. The next prime is 28071731. The reversal of 28071729 is 92717082.

It is not a de Polignac number, because 28071729 - 2⁴ = 28071713 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 28071693 and 28071702.

It is not an unprimeable number, because it can be changed into a prime (28061729) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 222729 + ... + 222854.

It is an arithmetic number, because the mean of its divisors is an integer number (3861728).

Almost surely, 2^28071729 is an apocalyptic number.

It is an amenable number.

28071729 is a deficient number, since it is larger than the sum of its proper divisors (18269007).

28071729 is a wasteful number, since it uses less digits than its factorization.

28071729 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 445596 (or 445593 counting only the distinct ones).

The product of its (nonzero) digits is 14112, while the sum is 36.

The square root of 28071729 is about 5298.2760403739. The cubic root of 28071729 is about 303.9179754754.

The spelling of 28071729 in words is "twenty-eight million, seventy-one thousand, seven hundred twenty-nine".