68189791 has 4 divisors (see below), whose sum is σ = 68352184. Its totient is φ = 68027400.

The previous prime is 68189767. The next prime is 68189813. The reversal of 68189791 is 19798186.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 68189791 - 2¹³ = 68181599 is a prime.

It is a super-3 number, since 3×68189791³ (a number of 24 digits) contains 333 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (68189711) 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, 80565 + ... + 81406.

It is an arithmetic number, because the mean of its divisors is an integer number (17088046).

Almost surely, 2^68189791 is an apocalyptic number.

68189791 is a deficient number, since it is larger than the sum of its proper divisors (162393).

68189791 is a wasteful number, since it uses less digits than its factorization.

68189791 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 162392.

The product of its digits is 217728, while the sum is 49.

The square root of 68189791 is about 8257.7110024510. The cubic root of 68189791 is about 408.5448934340.

The spelling of 68189791 in words is "sixty-eight million, one hundred eighty-nine thousand, seven hundred ninety-one".