689979840 has 224 divisors, whose sum is σ = 2408749056. Its totient is φ = 165949440.

The previous prime is 689979839. The next prime is 689979859. The reversal of 689979840 is 48979986.

It is a Harshad number since it is a multiple of its sum of digits (60).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 2354734 + ... + 2355026.

It is an arithmetic number, because the mean of its divisors is an integer number (10753344).

Almost surely, 2^689979840 is an apocalyptic number.

689979840 is a gapful number since it is divisible by the number (60) 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 689979840, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1204374528).

689979840 is an abundant number, since it is smaller than the sum of its proper divisors (1718769216).

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

689979840 is a wasteful number, since it uses less digits than its factorization.

689979840 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 547 (or 537 counting only the distinct ones).

The product of its (nonzero) digits is 7838208, while the sum is 60.

The square root of 689979840 is about 26267.4673312826. The cubic root of 689979840 is about 883.6469861195.

The spelling of 689979840 in words is "six hundred eighty-nine million, nine hundred seventy-nine thousand, eight hundred forty".