68406851 has 4 divisors (see below), whose sum is σ = 69997752. Its totient is φ = 66815952.

The previous prime is 68406829. The next prime is 68406869. The reversal of 68406851 is 15860486.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 15860486 = 2 ⋅7930243.

It is a cyclic number.

It is not a de Polignac number, because 68406851 - 2¹⁸ = 68144707 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (68406881) 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, 795386 + ... + 795471.

It is an arithmetic number, because the mean of its divisors is an integer number (17499438).

Almost surely, 2^68406851 is an apocalyptic number.

68406851 is a deficient number, since it is larger than the sum of its proper divisors (1590901).

68406851 is a wasteful number, since it uses less digits than its factorization.

68406851 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1590900.

The product of its (nonzero) digits is 46080, while the sum is 38.

The square root of 68406851 is about 8270.8434273658. The cubic root of 68406851 is about 408.9779241756.

The spelling of 68406851 in words is "sixty-eight million, four hundred six thousand, eight hundred fifty-one".