1689778852 has 12 divisors (see below), whose sum is σ = 3131060940. Its totient is φ = 795190016.

The previous prime is 1689778841. The next prime is 1689778861. The reversal of 1689778852 is 2588779861.

It can be written as a sum of positive squares in 2 ways, for example, as 992502016 + 697276836 = 31504^2 + 26406^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 12424777 + ... + 12424912.

It is an arithmetic number, because the mean of its divisors is an integer number (260921745).

Almost surely, 2^1689778852 is an apocalyptic number.

It is an amenable number.

1689778852 is a deficient number, since it is larger than the sum of its proper divisors (1441282088).

1689778852 is a wasteful number, since it uses less digits than its factorization.

1689778852 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24849710 (or 24849708 counting only the distinct ones).

The product of its digits is 13547520, while the sum is 61.

The square root of 1689778852 is about 41106.9197581137. The cubic root of 1689778852 is about 1191.0864667406.

The spelling of 1689778852 in words is "one billion, six hundred eighty-nine million, seven hundred seventy-eight thousand, eight hundred fifty-two".