91667642 has 16 divisors (see below), whose sum is σ = 150444000. Its totient is φ = 41544240.

The previous prime is 91667599. The next prime is 91667663. The reversal of 91667642 is 24676619.

It is a self number, because there is not a number n which added to its sum of digits gives 91667642.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1709 + ... + 13647.

It is an arithmetic number, because the mean of its divisors is an integer number (9402750).

Almost surely, 2^91667642 is an apocalyptic number.

91667642 is a deficient number, since it is larger than the sum of its proper divisors (58776358).

91667642 is a wasteful number, since it uses less digits than its factorization.

91667642 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12301.

The product of its digits is 108864, while the sum is 41.

The square root of 91667642 is about 9574.3220125500. The cubic root of 91667642 is about 450.8914706496.

The spelling of 91667642 in words is "ninety-one million, six hundred sixty-seven thousand, six hundred forty-two".