91534878660 has 48 divisors (see below), whose sum is σ = 256334291136. Its totient is φ = 24405812352.

The previous prime is 91534878649. The next prime is 91534878703. The reversal of 91534878660 is 6687843519.

It is a super-2 number, since 2×91534878660² (a number of 23 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 91534878660.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 328819 + ... + 539621.

It is an arithmetic number, because the mean of its divisors is an integer number (5340297732).

Almost surely, 2^91534878660 is an apocalyptic number.

It is an amenable number.

91534878660 is an abundant number, since it is smaller than the sum of its proper divisors (164799412476).

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

91534878660 is a wasteful number, since it uses less digits than its factorization.

91534878660 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 218052 (or 218050 counting only the distinct ones).

The product of its (nonzero) digits is 8709120, while the sum is 57.

The spelling of 91534878660 in words is "ninety-one billion, five hundred thirty-four million, eight hundred seventy-eight thousand, six hundred sixty".