68512867 has 4 divisors (see below), whose sum is σ = 68533560. Its totient is φ = 68492176.

The previous prime is 68512861. The next prime is 68512891. The reversal of 68512867 is 76821586.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 76821586 = 2 ⋅38410793.

It is a 4-Lehmer number, since φ(68512867) divides (68512867-1)⁴.

It is a cyclic number.

It is not a de Polignac number, because 68512867 - 2⁷ = 68512739 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (68512861) 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, 4138 + ... + 12415.

It is an arithmetic number, because the mean of its divisors is an integer number (17133390).

It is a Poulet number, since it divides 2^68512866-1.

Almost surely, 2^68512867 is an apocalyptic number.

68512867 is the 4139-th decagonal number.

68512867 is a deficient number, since it is larger than the sum of its proper divisors (20693).

68512867 is a wasteful number, since it uses less digits than its factorization.

68512867 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20692.

The product of its digits is 161280, while the sum is 43.

The square root of 68512867 is about 8277.2499660213. The cubic root of 68512867 is about 409.1890912521.

The spelling of 68512867 in words is "sixty-eight million, five hundred twelve thousand, eight hundred sixty-seven".