1688228861 has 8 divisors (see below), whose sum is σ = 1880889984. Its totient is φ = 1502098720.

The previous prime is 1688228851. The next prime is 1688228873.

It is a happy number.

1688228861 is nontrivially palindromic in base 10.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1688228861 is a prime.

It is a super-2 number, since 2×1688228861² = 5700233374226714642, which contains 22 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 (1688228851) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1632200 + ... + 1633233.

It is an arithmetic number, because the mean of its divisors is an integer number (235111248).

Almost surely, 2^1688228861 is an apocalyptic number.

1688228861 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

1688228861 is a deficient number, since it is larger than the sum of its proper divisors (192661123).

1688228861 is a wasteful number, since it uses less digits than its factorization.

1688228861 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3265491.

The product of its digits is 589824, while the sum is 50.

The square root of 1688228861 is about 41088.0622687418. The cubic root of 1688228861 is about 1190.7221709291.

The spelling of 1688228861 in words is "one billion, six hundred eighty-eight million, two hundred twenty-eight thousand, eight hundred sixty-one".