68791997 has 4 divisors (see below), whose sum is σ = 68815776. Its totient is φ = 68768220.

The previous prime is 68791993. The next prime is 68791999. The reversal of 68791997 is 79919786.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 79919786 = 2 ⋅39959893.

It is a cyclic number.

It is not a de Polignac number, because 68791997 - 2² = 68791993 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (68791993) 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, 6833 + ... + 13574.

It is an arithmetic number, because the mean of its divisors is an integer number (17203944).

Almost surely, 2^68791997 is an apocalyptic number.

It is an amenable number.

68791997 is a deficient number, since it is larger than the sum of its proper divisors (23779).

68791997 is a wasteful number, since it uses less digits than its factorization.

68791997 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23778.

The product of its digits is 1714608, while the sum is 56.

The square root of 68791997 is about 8294.0941036378. The cubic root of 68791997 is about 409.7440341642.

The spelling of 68791997 in words is "sixty-eight million, seven hundred ninety-one thousand, nine hundred ninety-seven".