68479381 has 4 divisors (see below), whose sum is σ = 69185452. Its totient is φ = 67773312.

The previous prime is 68479331. The next prime is 68479387. The reversal of 68479381 is 18397486.

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: 18397486 = 2 ⋅9198743.

It can be written as a sum of positive squares in 2 ways, for example, as 37576900 + 30902481 = 6130^2 + 5559^2 .

It is a cyclic number.

It is not a de Polignac number, because 68479381 - 2⁷ = 68479253 is a prime.

It is a super-2 number, since 2×68479381² = 9378851244286322, 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 (68479387) 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, 352890 + ... + 353083.

It is an arithmetic number, because the mean of its divisors is an integer number (17296363).

Almost surely, 2^68479381 is an apocalyptic number.

It is an amenable number.

68479381 is a deficient number, since it is larger than the sum of its proper divisors (706071).

68479381 is an equidigital number, since it uses as much as digits as its factorization.

68479381 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 706070.

The product of its digits is 290304, while the sum is 46.

The square root of 68479381 is about 8275.2269455284. The cubic root of 68479381 is about 409.1224159961.

The spelling of 68479381 in words is "sixty-eight million, four hundred seventy-nine thousand, three hundred eighty-one".