91806536 has 8 divisors (see below), whose sum is σ = 172137270. Its totient is φ = 45903264.

The previous prime is 91806529. The next prime is 91806541. The reversal of 91806536 is 63560819.

It can be written as a sum of positive squares in only one way, i.e., 61622500 + 30184036 = 7850^2 + 5494^2 .

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 91806536.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5737901 + ... + 5737916.

Almost surely, 2^91806536 is an apocalyptic number.

It is an amenable number.

91806536 is a deficient number, since it is larger than the sum of its proper divisors (80330734).

91806536 is a wasteful number, since it uses less digits than its factorization.

91806536 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11475823 (or 11475819 counting only the distinct ones).

The product of its (nonzero) digits is 38880, while the sum is 38.

The square root of 91806536 is about 9581.5727310291. The cubic root of 91806536 is about 451.1190846509.

The spelling of 91806536 in words is "ninety-one million, eight hundred six thousand, five hundred thirty-six".