68089781 has 8 divisors (see below), whose sum is σ = 69424128. Its totient is φ = 66766000.

The previous prime is 68089759. The next prime is 68089799. The reversal of 68089781 is 18798086.

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 68089781 - 2²² = 63895477 is a prime.

It is a super-2 number, since 2×68089781² = 9272436553255922, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (68089751) 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, 11051 + ... + 16071.

It is an arithmetic number, because the mean of its divisors is an integer number (8678016).

Almost surely, 2^68089781 is an apocalyptic number.

It is an amenable number.

68089781 is a deficient number, since it is larger than the sum of its proper divisors (1334347).

68089781 is a wasteful number, since it uses less digits than its factorization.

68089781 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5283.

The product of its (nonzero) digits is 193536, while the sum is 47.

The square root of 68089781 is about 8251.6532282931. The cubic root of 68089781 is about 408.3450660334.

The spelling of 68089781 in words is "sixty-eight million, eighty-nine thousand, seven hundred eighty-one".