91724005 has 8 divisors (see below), whose sum is σ = 111712032. Its totient is φ = 72283728.

The previous prime is 91723997. The next prime is 91724029. The reversal of 91724005 is 50042719.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 91724005 - 2³ = 91723997 is a prime.

It is a Duffinian number.

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, 136567 + ... + 137236.

It is an arithmetic number, because the mean of its divisors is an integer number (13964004).

Almost surely, 2^91724005 is an apocalyptic number.

It is an amenable number.

91724005 is a deficient number, since it is larger than the sum of its proper divisors (19988027).

91724005 is a wasteful number, since it uses less digits than its factorization.

91724005 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 273875.

The product of its (nonzero) digits is 2520, while the sum is 28.

The square root of 91724005 is about 9577.2650062531. The cubic root of 91724005 is about 450.9838638088.

The spelling of 91724005 in words is "ninety-one million, seven hundred twenty-four thousand, five".