68034781 has 4 divisors (see below), whose sum is σ = 68054652. Its totient is φ = 68014912.

The previous prime is 68034779. The next prime is 68034787. The reversal of 68034781 is 18743086.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 18743086 = 2 ⋅9371543.

It can be written as a sum of positive squares in 2 ways, for example, as 30702681 + 37332100 = 5541^2 + 6110^2 .

It is a cyclic number.

It is not a de Polignac number, because 68034781 - 2¹ = 68034779 is a prime.

It is a super-2 number, since 2×68034781² = 9257462851435922, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 68034781.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (68034787) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3340 + ... + 12133.

It is an arithmetic number, because the mean of its divisors is an integer number (17013663).

Almost surely, 2^68034781 is an apocalyptic number.

It is an amenable number.

68034781 is a deficient number, since it is larger than the sum of its proper divisors (19871).

68034781 is a wasteful number, since it uses less digits than its factorization.

68034781 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19870.

The product of its (nonzero) digits is 32256, while the sum is 37.

The square root of 68034781 is about 8248.3198895290. The cubic root of 68034781 is about 408.2350885490.

The spelling of 68034781 in words is "sixty-eight million, thirty-four thousand, seven hundred eighty-one".