689020840 has 32 divisors (see below), whose sum is σ = 1551107880. Its totient is φ = 275464192.

The previous prime is 689020837. The next prime is 689020841. The reversal of 689020840 is 48020986.

It can be written as a sum of positive squares in 4 ways, for example, as 676104004 + 12916836 = 26002^2 + 3594^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 689020840.

It is not an unprimeable number, because it can be changed into a prime (689020841) 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, 106992 + ... + 113248.

Almost surely, 2^689020840 is an apocalyptic number.

It is an amenable number.

689020840 is an abundant number, since it is smaller than the sum of its proper divisors (862087040).

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

689020840 is a wasteful number, since it uses less digits than its factorization.

689020840 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9021 (or 9017 counting only the distinct ones).

The product of its (nonzero) digits is 27648, while the sum is 37.

The square root of 689020840 is about 26249.2064641962. The cubic root of 689020840 is about 883.2374039253.

It can be divided in two parts, 6890 and 20840, that added together give a triangular number (27730 = T₂₃₅).

The spelling of 689020840 in words is "six hundred eighty-nine million, twenty thousand, eight hundred forty".