68406739 has 4 divisors (see below), whose sum is σ = 70613440. Its totient is φ = 66200040.

The previous prime is 68406733. The next prime is 68406743. The reversal of 68406739 is 93760486.

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: 93760486 = 2 ⋅46880243.

It is a cyclic number.

It is not a de Polignac number, because 68406739 - 2⁹ = 68406227 is a prime.

It is a super-2 number, since 2×68406739² = 9358963881228242, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 68406695 and 68406704.

It is not an unprimeable number, because it can be changed into a prime (68406733) 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, 1103304 + ... + 1103365.

It is an arithmetic number, because the mean of its divisors is an integer number (17653360).

Almost surely, 2^68406739 is an apocalyptic number.

68406739 is a deficient number, since it is larger than the sum of its proper divisors (2206701).

68406739 is a wasteful number, since it uses less digits than its factorization.

68406739 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2206700.

The product of its (nonzero) digits is 217728, while the sum is 43.

The square root of 68406739 is about 8270.8366565904. The cubic root of 68406739 is about 408.9777009740.

The spelling of 68406739 in words is "sixty-eight million, four hundred six thousand, seven hundred thirty-nine".