68715905 has 4 divisors (see below), whose sum is σ = 82459092. Its totient is φ = 54972720.

The previous prime is 68715883. The next prime is 68715923. The reversal of 68715905 is 50951786.

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 28558336 + 40157569 = 5344^2 + 6337^2 .

It is a de Polignac number, because none of the positive numbers 2^k-68715905 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6871586 + ... + 6871595.

It is an arithmetic number, because the mean of its divisors is an integer number (20614773).

Almost surely, 2^68715905 is an apocalyptic number.

It is an amenable number.

68715905 is a deficient number, since it is larger than the sum of its proper divisors (13743187).

68715905 is a wasteful number, since it uses less digits than its factorization.

68715905 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13743186.

The product of its (nonzero) digits is 75600, while the sum is 41.

The square root of 68715905 is about 8289.5057150593. The cubic root of 68715905 is about 409.5929034752.

The spelling of 68715905 in words is "sixty-eight million, seven hundred fifteen thousand, nine hundred five".