689249088 has 392 divisors, whose sum is σ = 2398654080. Its totient is φ = 194088960.

The previous prime is 689249087. The next prime is 689249089. The reversal of 689249088 is 880942986.

689249088 is a `hidden beast` number, since 68 + 92 + 490 + 8 + 8 = 666.

It is an interprime number because it is at equal distance from previous prime (689249087) and next prime (689249089).

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (689249083) 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 55 ways as a sum of consecutive naturals, for example, 8724633 + ... + 8724711.

Almost surely, 2^689249088 is an apocalyptic number.

689249088 is a gapful number since it is divisible by the number (68) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 689249088, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1199327040).

689249088 is an abundant number, since it is smaller than the sum of its proper divisors (1709404992).

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

689249088 is a wasteful number, since it uses less digits than its factorization.

689249088 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 137 (or 112 counting only the distinct ones).

The product of its (nonzero) digits is 1990656, while the sum is 54.

The square root of 689249088 is about 26253.5538165788. The cubic root of 689249088 is about 883.3349214955.

The spelling of 689249088 in words is "six hundred eighty-nine million, two hundred forty-nine thousand, eighty-eight".