68889661 has 4 divisors (see below), whose sum is σ = 72942012. Its totient is φ = 64837312.

The previous prime is 68889647. The next prime is 68889677. The reversal of 68889661 is 16698886.

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

It can be written as a sum of positive squares in 2 ways, for example, as 51408900 + 17480761 = 7170^2 + 4181^2 .

It is a cyclic number.

It is not a de Polignac number, because 68889661 - 2¹⁹ = 68365373 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 68889599 and 68889608.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (68889631) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2026150 + ... + 2026183.

It is an arithmetic number, because the mean of its divisors is an integer number (18235503).

Almost surely, 2^68889661 is an apocalyptic number.

It is an amenable number.

68889661 is a deficient number, since it is larger than the sum of its proper divisors (4052351).

68889661 is a wasteful number, since it uses less digits than its factorization.

68889661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4052350.

The product of its digits is 995328, while the sum is 52.

The square root of 68889661 is about 8299.9795782881. The cubic root of 68889661 is about 409.9378470132.

The spelling of 68889661 in words is "sixty-eight million, eight hundred eighty-nine thousand, six hundred sixty-one".