91680144 has 40 divisors (see below), whose sum is σ = 244484352. Its totient is φ = 29573760.

The previous prime is 91680131. The next prime is 91680151. The reversal of 91680144 is 44108619.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 29319 + ... + 32294.

Almost surely, 2^91680144 is an apocalyptic number.

It is an amenable number.

91680144 is an abundant number, since it is smaller than the sum of its proper divisors (152804208).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

91680144 is a wasteful number, since it uses less digits than its factorization.

91680144 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 61655 (or 61649 counting only the distinct ones).

The product of its (nonzero) digits is 6912, while the sum is 33.

The square root of 91680144 is about 9574.9748824736. The cubic root of 91680144 is about 450.9119678458.

The spelling of 91680144 in words is "ninety-one million, six hundred eighty thousand, one hundred forty-four".