689491494 has 32 divisors (see below), whose sum is σ = 1612848000. Its totient is φ = 217733832.

The previous prime is 689491489. The next prime is 689491499. The reversal of 689491494 is 494194986.

It is a happy number.

689491494 is a `hidden beast` number, since 68 + 9 + 4 + 91 + 494 = 666.

It is an interprime number because it is at equal distance from previous prime (689491489) and next prime (689491499).

It is a Harshad number since it is a multiple of its sum of digits (54).

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 689491494.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (689491499) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 334984 + ... + 337035.

It is an arithmetic number, because the mean of its divisors is an integer number (50401500).

Almost surely, 2^689491494 is an apocalyptic number.

689491494 is an abundant number, since it is smaller than the sum of its proper divisors (923356506).

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

689491494 is a wasteful number, since it uses less digits than its factorization.

689491494 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 672049 (or 672043 counting only the distinct ones).

The product of its digits is 2239488, while the sum is 54.

The square root of 689491494 is about 26258.1700428648. The cubic root of 689491494 is about 883.4384644145.

The spelling of 689491494 in words is "six hundred eighty-nine million, four hundred ninety-one thousand, four hundred ninety-four".