68072105 has 4 divisors (see below), whose sum is σ = 81686532. Its totient is φ = 54457680.

The previous prime is 68072071. The next prime is 68072107. The reversal of 68072105 is 50127086.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 44462224 + 23609881 = 6668^2 + 4859^2 .

It is not a de Polignac number, because 68072105 - 2²⁰ = 67023529 is a prime.

It is a super-2 number, since 2×68072105² = 9267622958262050, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (68072107) 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, 6807206 + ... + 6807215.

It is an arithmetic number, because the mean of its divisors is an integer number (20421633).

Almost surely, 2^68072105 is an apocalyptic number.

It is an amenable number.

68072105 is a deficient number, since it is larger than the sum of its proper divisors (13614427).

68072105 is a wasteful number, since it uses less digits than its factorization.

68072105 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13614426.

The product of its (nonzero) digits is 3360, while the sum is 29.

The square root of 68072105 is about 8250.5821006763. The cubic root of 68072105 is about 408.3097277298.

The spelling of 68072105 in words is "sixty-eight million, seventy-two thousand, one hundred five".