68891081 has 8 divisors (see below), whose sum is σ = 79729920. Its totient is φ = 58301568.

The previous prime is 68891071. The next prime is 68891099. The reversal of 68891081 is 18019886.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 68891081 - 2¹⁰ = 68890057 is a prime.

It is a super-2 number, since 2×68891081² = 9491962082697122, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (68891071) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 61736 + ... + 62841.

It is an arithmetic number, because the mean of its divisors is an integer number (9966240).

Almost surely, 2^68891081 is an apocalyptic number.

It is an amenable number.

68891081 is a deficient number, since it is larger than the sum of its proper divisors (10838839).

68891081 is a wasteful number, since it uses less digits than its factorization.

68891081 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 124663.

The product of its (nonzero) digits is 27648, while the sum is 41.

The square root of 68891081 is about 8300.0651202265. The cubic root of 68891081 is about 409.9406636320.

The spelling of 68891081 in words is "sixty-eight million, eight hundred ninety-one thousand, eighty-one".