91671856 has 10 divisors (see below), whose sum is σ = 177614252. Its totient is φ = 45835920.

The previous prime is 91671851. The next prime is 91671883. The reversal of 91671856 is 65817619.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (91671851) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2864730 + ... + 2864761.

Almost surely, 2^91671856 is an apocalyptic number.

It is an amenable number.

91671856 is a deficient number, since it is larger than the sum of its proper divisors (85942396).

91671856 is a wasteful number, since it uses less digits than its factorization.

91671856 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5729499 (or 5729493 counting only the distinct ones).

The product of its digits is 90720, while the sum is 43.

The square root of 91671856 is about 9574.5420778228. The cubic root of 91671856 is about 450.8983797672.

The spelling of 91671856 in words is "ninety-one million, six hundred seventy-one thousand, eight hundred fifty-six".