68088591 has 12 divisors (see below), whose sum is σ = 98611968. Its totient is φ = 45271584.

The previous prime is 68088583. The next prime is 68088611. The reversal of 68088591 is 19588086.

It is not a de Polignac number, because 68088591 - 2³ = 68088583 is a prime.

It is a Smith number, since the sum of its digits (45) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (68088511) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 6430 + ... + 13323.

It is an arithmetic number, because the mean of its divisors is an integer number (8217664).

Almost surely, 2^68088591 is an apocalyptic number.

68088591 is a deficient number, since it is larger than the sum of its proper divisors (30523377).

68088591 is a wasteful number, since it uses less digits than its factorization.

68088591 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20142 (or 20139 counting only the distinct ones).

The product of its (nonzero) digits is 138240, while the sum is 45.

The square root of 68088591 is about 8251.5811212155. The cubic root of 68088591 is about 408.3426871475.

The spelling of 68088591 in words is "sixty-eight million, eighty-eight thousand, five hundred ninety-one".