689820840 has 128 divisors (see below), whose sum is σ = 2420496000. Its totient is φ = 174265344.

The previous prime is 689820839. The next prime is 689820851. The reversal of 689820840 is 48028986.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (45).

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, 3712 + ... + 37328.

It is an arithmetic number, because the mean of its divisors is an integer number (18910125).

Almost surely, 2^689820840 is an apocalyptic number.

689820840 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 689820840, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1210248000).

689820840 is an abundant number, since it is smaller than the sum of its proper divisors (1730675160).

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

689820840 is a wasteful number, since it uses less digits than its factorization.

689820840 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 33656 (or 33646 counting only the distinct ones).

The product of its (nonzero) digits is 221184, while the sum is 45.

The square root of 689820840 is about 26264.4405994112. The cubic root of 689820840 is about 883.5791045881.

The spelling of 689820840 in words is "six hundred eighty-nine million, eight hundred twenty thousand, eight hundred forty".