68538591 has 12 divisors (see below), whose sum is σ = 108000360. Its totient is φ = 41538480.

The previous prime is 68538557. The next prime is 68538601. The reversal of 68538591 is 19583586.

68538591 is a `hidden beast` number, since 6 + 8 + 53 + 8 + 591 = 666.

It is not a de Polignac number, because 68538591 - 2⁶ = 68538527 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (68538391) 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, 346056 + ... + 346253.

It is an arithmetic number, because the mean of its divisors is an integer number (9000030).

Almost surely, 2^68538591 is an apocalyptic number.

68538591 is a deficient number, since it is larger than the sum of its proper divisors (39461769).

68538591 is a wasteful number, since it uses less digits than its factorization.

68538591 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 692326 (or 692323 counting only the distinct ones).

The product of its digits is 259200, while the sum is 45.

The square root of 68538591 is about 8278.8037179293. The cubic root of 68538591 is about 409.2402965393.

The spelling of 68538591 in words is "sixty-eight million, five hundred thirty-eight thousand, five hundred ninety-one".