68913591 has 8 divisors (see below), whose sum is σ = 93391344. Its totient is φ = 45189120.

The previous prime is 68913583. The next prime is 68913617. The reversal of 68913591 is 19531986.

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

It is not a de Polignac number, because 68913591 - 2³ = 68913583 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (68913511) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 188106 + ... + 188471.

It is an arithmetic number, because the mean of its divisors is an integer number (11673918).

Almost surely, 2^68913591 is an apocalyptic number.

68913591 is a gapful number since it is divisible by the number (61) formed by its first and last digit.

68913591 is a deficient number, since it is larger than the sum of its proper divisors (24477753).

68913591 is a wasteful number, since it uses less digits than its factorization.

68913591 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 376641.

The product of its digits is 58320, while the sum is 42.

The square root of 68913591 is about 8301.4210229334. The cubic root of 68913591 is about 409.9853078217.

The spelling of 68913591 in words is "sixty-eight million, nine hundred thirteen thousand, five hundred ninety-one".