91664542 has 8 divisors (see below), whose sum is σ = 137586600. Its totient is φ = 45802344.

The previous prime is 91664497. The next prime is 91664543. The reversal of 91664542 is 24546619.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (91664543) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 10917 + ... + 17392.

It is an arithmetic number, because the mean of its divisors is an integer number (17198325).

Almost surely, 2^91664542 is an apocalyptic number.

91664542 is a deficient number, since it is larger than the sum of its proper divisors (45922058).

91664542 is a wasteful number, since it uses less digits than its factorization.

91664542 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 29930.

The product of its digits is 51840, while the sum is 37.

The square root of 91664542 is about 9574.1601198225. The cubic root of 91664542 is about 450.8863878698.

The spelling of 91664542 in words is "ninety-one million, six hundred sixty-four thousand, five hundred forty-two".