684235020 has 144 divisors (see below), whose sum is σ = 2241243648. Its totient is φ = 155514240.

The previous prime is 684235009. The next prime is 684235061. The reversal of 684235020 is 20532486.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is an unprimeable number.

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 47 ways as a sum of consecutive naturals, for example, 619789 + ... + 620891.

It is an arithmetic number, because the mean of its divisors is an integer number (15564192).

Almost surely, 2^684235020 is an apocalyptic number.

684235020 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 684235020, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1120621824).

684235020 is an abundant number, since it is smaller than the sum of its proper divisors (1557008628).

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

684235020 is a wasteful number, since it uses less digits than its factorization.

684235020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1340 (or 1331 counting only the distinct ones).

The product of its (nonzero) digits is 11520, while the sum is 30.

The square root of 684235020 is about 26157.8863825042. The cubic root of 684235020 is about 881.1877127144.

The spelling of 684235020 in words is "six hundred eighty-four million, two hundred thirty-five thousand, twenty".