91234405688 has 32 divisors (see below), whose sum is σ = 172062092160. Its totient is φ = 45351852000.

The previous prime is 91234405627. The next prime is 91234405729. The reversal of 91234405688 is 88650443219.

It is a Smith number, since the sum of its digits (50) coincides with the sum of the digits of its prime factors.

It is a congruent number.

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, 1056845 + ... + 1139907.

It is an arithmetic number, because the mean of its divisors is an integer number (5376940380).

Almost surely, 2^91234405688 is an apocalyptic number.

It is an amenable number.

91234405688 is a deficient number, since it is larger than the sum of its proper divisors (80827686472).

91234405688 is a wasteful number, since it uses less digits than its factorization.

91234405688 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 83867 (or 83863 counting only the distinct ones).

The product of its (nonzero) digits is 1658880, while the sum is 50.

The spelling of 91234405688 in words is "ninety-one billion, two hundred thirty-four million, four hundred five thousand, six hundred eighty-eight".