91770641 has 8 divisors (see below), whose sum is σ = 97660800. Its totient is φ = 85935168.

The previous prime is 91770617. The next prime is 91770647. The reversal of 91770641 is 14607719.

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 91770641 - 2¹⁰ = 91769617 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (91770647) 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 7 ways as a sum of consecutive naturals, for example, 10181 + ... + 16946.

It is an arithmetic number, because the mean of its divisors is an integer number (12207600).

Almost surely, 2^91770641 is an apocalyptic number.

It is an amenable number.

91770641 is a deficient number, since it is larger than the sum of its proper divisors (5890159).

91770641 is a wasteful number, since it uses less digits than its factorization.

91770641 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27343.

The product of its (nonzero) digits is 10584, while the sum is 35.

The square root of 91770641 is about 9579.6994211718. The cubic root of 91770641 is about 451.0602833530.

The spelling of 91770641 in words is "ninety-one million, seven hundred seventy thousand, six hundred forty-one".