91063778 has 16 divisors (see below), whose sum is σ = 147723576. Its totient is φ = 41852160.

The previous prime is 91063759. The next prime is 91063783. The reversal of 91063778 is 87736019.

It can be written as a sum of positive squares in 4 ways, for example, as 75986089 + 15077689 = 8717^2 + 3883^2 .

It is a super-2 number, since 2×91063778² = 16585223327266568, which contains 22 as substring.

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, 1001 + ... + 13532.

Almost surely, 2^91063778 is an apocalyptic number.

91063778 is a deficient number, since it is larger than the sum of its proper divisors (56659798).

91063778 is a wasteful number, since it uses less digits than its factorization.

91063778 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14789.

The product of its (nonzero) digits is 63504, while the sum is 41.

The square root of 91063778 is about 9542.7343041709. The cubic root of 91063778 is about 449.8992004680.

The spelling of 91063778 in words is "ninety-one million, sixty-three thousand, seven hundred seventy-eight".