689947812 has 18 divisors (see below), whose sum is σ = 1744034838. Its totient is φ = 229982592.

The previous prime is 689947807. The next prime is 689947823. The reversal of 689947812 is 218749986.

It can be written as a sum of positive squares in only one way, i.e., 394657956 + 295289856 = 19866^2 + 17184^2 .

It is a tau number, because it is divible by the number of its divisors (18).

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 9582573 + ... + 9582644.

Almost surely, 2^689947812 is an apocalyptic number.

It is an amenable number.

689947812 is an abundant number, since it is smaller than the sum of its proper divisors (1054087026).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

689947812 is a wasteful number, since it uses less digits than its factorization.

689947812 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19165227 (or 19165222 counting only the distinct ones).

The product of its digits is 1741824, while the sum is 54.

The square root of 689947812 is about 26266.8576727404. The cubic root of 689947812 is about 883.6333133125.

The spelling of 689947812 in words is "six hundred eighty-nine million, nine hundred forty-seven thousand, eight hundred twelve".