68005491 has 16 divisors (see below), whose sum is σ = 97228800. Its totient is φ = 42127488.

The previous prime is 68005481. The next prime is 68005507. The reversal of 68005491 is 19450086.

It is not a de Polignac number, because 68005491 - 2⁵ = 68005459 is a prime.

It is not an unprimeable number, because it can be changed into a prime (68005471) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4411 + ... + 12468.

It is an arithmetic number, because the mean of its divisors is an integer number (6076800).

Almost surely, 2^68005491 is an apocalyptic number.

68005491 is a deficient number, since it is larger than the sum of its proper divisors (29223309).

68005491 is a wasteful number, since it uses less digits than its factorization.

68005491 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16978.

The product of its (nonzero) digits is 8640, while the sum is 33.

The square root of 68005491 is about 8246.5441852936. The cubic root of 68005491 is about 408.1764963510.

The spelling of 68005491 in words is "sixty-eight million, five thousand, four hundred ninety-one".