68508891 has 12 divisors (see below), whose sum is σ = 107953560. Its totient is φ = 41520480.

The previous prime is 68508887. The next prime is 68508893. The reversal of 68508891 is 19880586.

68508891 is a `hidden beast` number, since 68 + 508 + 89 + 1 = 666.

It is not a de Polignac number, because 68508891 - 2² = 68508887 is a prime.

It is not an unprimeable number, because it can be changed into a prime (68508893) 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, 345906 + ... + 346103.

It is an arithmetic number, because the mean of its divisors is an integer number (8996130).

Almost surely, 2^68508891 is an apocalyptic number.

68508891 is a deficient number, since it is larger than the sum of its proper divisors (39444669).

68508891 is a wasteful number, since it uses less digits than its factorization.

68508891 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 692026 (or 692023 counting only the distinct ones).

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

The square root of 68508891 is about 8277.0097861486. The cubic root of 68508891 is about 409.1811756232.

The spelling of 68508891 in words is "sixty-eight million, five hundred eight thousand, eight hundred ninety-one".