91890776 has 8 divisors (see below), whose sum is σ = 172295220. Its totient is φ = 45945384.

The previous prime is 91890767. The next prime is 91890779. The reversal of 91890776 is 67709819.

It is a tau number, because it is divible by the number of its divisors (8).

It is a self number, because there is not a number n which added to its sum of digits gives 91890776.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (91890779) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5743166 + ... + 5743181.

Almost surely, 2^91890776 is an apocalyptic number.

It is an amenable number.

91890776 is a deficient number, since it is larger than the sum of its proper divisors (80404444).

91890776 is a wasteful number, since it uses less digits than its factorization.

91890776 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11486353 (or 11486349 counting only the distinct ones).

The product of its (nonzero) digits is 190512, while the sum is 47.

The square root of 91890776 is about 9585.9676611180. The cubic root of 91890776 is about 451.2570220130.

The spelling of 91890776 in words is "ninety-one million, eight hundred ninety thousand, seven hundred seventy-six".