689561620 has 48 divisors (see below), whose sum is σ = 1648418688. Its totient is φ = 239845760.

The previous prime is 689561617. The next prime is 689561627. The reversal of 689561620 is 26165986.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (689561627) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 63079 + ... + 73198.

It is an arithmetic number, because the mean of its divisors is an integer number (34342056).

Almost surely, 2^689561620 is an apocalyptic number.

It is an amenable number.

689561620 is an abundant number, since it is smaller than the sum of its proper divisors (958857068).

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

689561620 is a wasteful number, since it uses less digits than its factorization.

689561620 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 136320 (or 136318 counting only the distinct ones).

The product of its (nonzero) digits is 155520, while the sum is 43.

The square root of 689561620 is about 26259.5053266432. The cubic root of 689561620 is about 883.4684139769.

The spelling of 689561620 in words is "six hundred eighty-nine million, five hundred sixty-one thousand, six hundred twenty".