68390681 has 4 divisors (see below), whose sum is σ = 70596864. Its totient is φ = 66184500.

The previous prime is 68390659. The next prime is 68390701. The reversal of 68390681 is 18609386.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 68390681 - 2¹⁴ = 68374297 is a prime.

It is a super-2 number, since 2×68390681² = 9354570495287522, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (68390611) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1103045 + ... + 1103106.

It is an arithmetic number, because the mean of its divisors is an integer number (17649216).

Almost surely, 2^68390681 is an apocalyptic number.

It is an amenable number.

68390681 is a deficient number, since it is larger than the sum of its proper divisors (2206183).

68390681 is a wasteful number, since it uses less digits than its factorization.

68390681 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2206182.

The product of its (nonzero) digits is 62208, while the sum is 41.

The square root of 68390681 is about 8269.8658392987. The cubic root of 68390681 is about 408.9456969250.

The spelling of 68390681 in words is "sixty-eight million, three hundred ninety thousand, six hundred eighty-one".