68926781 has 24 divisors (see below), whose sum is σ = 89631360. Its totient is φ = 52382400.

The previous prime is 68926763. The next prime is 68926783. The reversal of 68926781 is 18762986.

It is not a de Polignac number, because 68926781 - 2⁶ = 68926717 is a prime.

It is a super-2 number, since 2×68926781² = 9501802278043922, which contains 22 as substring.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (68926783) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 20540 + ... + 23658.

It is an arithmetic number, because the mean of its divisors is an integer number (3734640).

Almost surely, 2^68926781 is an apocalyptic number.

It is an amenable number.

68926781 is a deficient number, since it is larger than the sum of its proper divisors (20704579).

68926781 is a wasteful number, since it uses less digits than its factorization.

68926781 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3185 (or 3178 counting only the distinct ones).

The product of its digits is 290304, while the sum is 47.

The square root of 68926781 is about 8302.2154272218. The cubic root of 68926781 is about 410.0114630941.

The spelling of 68926781 in words is "sixty-eight million, nine hundred twenty-six thousand, seven hundred eighty-one".