91708538 has 8 divisors (see below), whose sum is σ = 139894560. Its totient is φ = 45077020.

The previous prime is 91708517. The next prime is 91708541. The reversal of 91708538 is 83580719.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a junction number, because it is equal to n+sod(n) for n = 91708495 and 91708504.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 388478 + ... + 388713.

It is an arithmetic number, because the mean of its divisors is an integer number (17486820).

Almost surely, 2^91708538 is an apocalyptic number.

91708538 is a deficient number, since it is larger than the sum of its proper divisors (48186022).

91708538 is a wasteful number, since it uses less digits than its factorization.

91708538 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 777252.

The product of its (nonzero) digits is 60480, while the sum is 41.

The square root of 91708538 is about 9576.4574869834. The cubic root of 91708538 is about 450.9585132675.

The spelling of 91708538 in words is "ninety-one million, seven hundred eight thousand, five hundred thirty-eight".