689755540 has 12 divisors (see below), whose sum is σ = 1448486676. Its totient is φ = 275902208.

The previous prime is 689755523. The next prime is 689755541. The reversal of 689755540 is 45557986.

It can be written as a sum of positive squares in 2 ways, for example, as 199487376 + 490268164 = 14124^2 + 22142^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (689755541) 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, 17243869 + ... + 17243908.

It is an arithmetic number, because the mean of its divisors is an integer number (120707223).

Almost surely, 2^689755540 is an apocalyptic number.

It is an amenable number.

689755540 is an abundant number, since it is smaller than the sum of its proper divisors (758731136).

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

689755540 is a wasteful number, since it uses less digits than its factorization.

689755540 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 34487786 (or 34487784 counting only the distinct ones).

The product of its (nonzero) digits is 1512000, while the sum is 49.

The square root of 689755540 is about 26263.1974443326. The cubic root of 689755540 is about 883.5512231765.

The spelling of 689755540 in words is "six hundred eighty-nine million, seven hundred fifty-five thousand, five hundred forty".