91708695540 has 144 divisors (see below), whose sum is σ = 346825664640. Its totient is φ = 19056349440.

The previous prime is 91708695503. The next prime is 91708695557. The reversal of 91708695540 is 4559680719.

91708695540 is a `hidden beast` number, since 9 + 1 + 7 + 0 + 8 + 6 + 95 + 540 = 666.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 3294535 + ... + 3322254.

It is an arithmetic number, because the mean of its divisors is an integer number (2408511560).

Almost surely, 2^91708695540 is an apocalyptic number.

91708695540 is a gapful number since it is divisible by the number (90) formed by its first and last digit.

It is an amenable number.

91708695540 is an abundant number, since it is smaller than the sum of its proper divisors (255116969100).

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

91708695540 is a wasteful number, since it uses less digits than its factorization.

91708695540 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6616822 (or 6616817 counting only the distinct ones).

The product of its (nonzero) digits is 2721600, while the sum is 54.

The spelling of 91708695540 in words is "ninety-one billion, seven hundred eight million, six hundred ninety-five thousand, five hundred forty".