68910891 has 16 divisors (see below), whose sum is σ = 110534400. Its totient is φ = 37304928.

The previous prime is 68910887. The next prime is 68910893. The reversal of 68910891 is 19801986.

It is not a de Polignac number, because 68910891 - 2² = 68910887 is a prime.

It is a super-3 number, since 3×68910891³ (a number of 24 digits) contains 333 as substring.

It is not an unprimeable number, because it can be changed into a prime (68910893) 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, 85956 + ... + 86753.

It is an arithmetic number, because the mean of its divisors is an integer number (6908400).

Almost surely, 2^68910891 is an apocalyptic number.

68910891 is a deficient number, since it is larger than the sum of its proper divisors (41623509).

68910891 is a wasteful number, since it uses less digits than its factorization.

68910891 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 172738.

The product of its (nonzero) digits is 31104, while the sum is 42.

The square root of 68910891 is about 8301.2583985803. The cubic root of 68910891 is about 409.9799534121.

The spelling of 68910891 in words is "sixty-eight million, nine hundred ten thousand, eight hundred ninety-one".