68511139 has 8 divisors (see below), whose sum is σ = 73910880. Its totient is φ = 63263616.

The previous prime is 68511133. The next prime is 68511199. The reversal of 68511139 is 93111586.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 68511139 - 2⁹ = 68510627 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (68511133) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 37119 + ... + 38920.

It is an arithmetic number, because the mean of its divisors is an integer number (9238860).

Almost surely, 2^68511139 is an apocalyptic number.

68511139 is a deficient number, since it is larger than the sum of its proper divisors (5399741).

68511139 is a wasteful number, since it uses less digits than its factorization.

68511139 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 76109.

The product of its digits is 6480, while the sum is 34.

The square root of 68511139 is about 8277.1455828685. The cubic root of 68511139 is about 409.1856510969.

The spelling of 68511139 in words is "sixty-eight million, five hundred eleven thousand, one hundred thirty-nine".