68091690 has 32 divisors (see below), whose sum is σ = 163840320. Its totient is φ = 18111104.

The previous prime is 68091689. The next prime is 68091703. The reversal of 68091690 is 9619086.

It is a super-2 number, since 2×68091690² = 9272956494112200, which contains 22 as substring.

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 9862 + ... + 15278.

It is an arithmetic number, because the mean of its divisors is an integer number (5120010).

Almost surely, 2^68091690 is an apocalyptic number.

68091690 is an abundant number, since it is smaller than the sum of its proper divisors (95748630).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

68091690 is a wasteful number, since it uses less digits than its factorization.

68091690 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5846.

The product of its (nonzero) digits is 23328, while the sum is 39.

The square root of 68091690 is about 8251.7689012720. The cubic root of 68091690 is about 408.3488821882.

The spelling of 68091690 in words is "sixty-eight million, ninety-one thousand, six hundred ninety".