689555394 has 48 divisors (see below), whose sum is σ = 1725740640. Its totient is φ = 196663680.

The previous prime is 689555393. The next prime is 689555431. The reversal of 689555394 is 493555986.

It is a happy number.

689555394 is a `hidden beast` number, since 6 + 89 + 5 + 553 + 9 + 4 = 666.

It is a self number, because there is not a number n which added to its sum of digits gives 689555394.

It is not an unprimeable number, because it can be changed into a prime (689555393) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 99064 + ... + 105795.

It is an arithmetic number, because the mean of its divisors is an integer number (35952930).

Almost surely, 2^689555394 is an apocalyptic number.

689555394 is an abundant number, since it is smaller than the sum of its proper divisors (1036185246).

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

689555394 is a wasteful number, since it uses less digits than its factorization.

689555394 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 204895 (or 204892 counting only the distinct ones).

The product of its digits is 5832000, while the sum is 54.

The square root of 689555394 is about 26259.3867788263. The cubic root of 689555394 is about 883.4657550456.

The spelling of 689555394 in words is "six hundred eighty-nine million, five hundred fifty-five thousand, three hundred ninety-four".