68361891 has 16 divisors (see below), whose sum is σ = 100015776. Its totient is φ = 41273856.

The previous prime is 68361877. The next prime is 68361899. The reversal of 68361891 is 19816386.

It is not a de Polignac number, because 68361891 - 2⁵ = 68361859 is a prime.

It is not an unprimeable number, because it can be changed into a prime (68361899) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 14470 + ... + 18603.

It is an arithmetic number, because the mean of its divisors is an integer number (6250986).

Almost surely, 2^68361891 is an apocalyptic number.

68361891 is a deficient number, since it is larger than the sum of its proper divisors (31653885).

68361891 is a wasteful number, since it uses less digits than its factorization.

68361891 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 33142.

The product of its digits is 62208, while the sum is 42.

The square root of 68361891 is about 8268.1249990551. The cubic root of 68361891 is about 408.8883050947. Note that the first 3 decimals are identical.

The spelling of 68361891 in words is "sixty-eight million, three hundred sixty-one thousand, eight hundred ninety-one".