91072729 has 8 divisors (see below), whose sum is σ = 100281888. Its totient is φ = 82018560.

The previous prime is 91072727. The next prime is 91072739. The reversal of 91072729 is 92727019.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 91072729 - 2¹ = 91072727 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (91072727) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 37512 + ... + 39865.

It is an arithmetic number, because the mean of its divisors is an integer number (12535236).

Almost surely, 2^91072729 is an apocalyptic number.

It is an amenable number.

91072729 is a deficient number, since it is larger than the sum of its proper divisors (9209159).

91072729 is a wasteful number, since it uses less digits than its factorization.

91072729 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 77495.

The product of its (nonzero) digits is 15876, while the sum is 37.

The square root of 91072729 is about 9543.2032882046. The cubic root of 91072729 is about 449.9139407445.

The spelling of 91072729 in words is "ninety-one million, seventy-two thousand, seven hundred twenty-nine".