331784420 has 72 divisors (see below), whose sum is σ = 777034944. Its totient is φ = 118888000.

The previous prime is 331784377. The next prime is 331784443. The reversal of 331784420 is 24487133.

It is a super-2 number, since 2×331784420² = 220161802709472800, which contains 22 as substring.

It is an unprimeable number.

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 23 ways as a sum of consecutive naturals, for example, 170855 + ... + 172785.

It is an arithmetic number, because the mean of its divisors is an integer number (10792152).

Almost surely, 2^331784420 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 331784420, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (388517472).

331784420 is an abundant number, since it is smaller than the sum of its proper divisors (445250524).

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

331784420 is a wasteful number, since it uses less digits than its factorization.

331784420 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2033 (or 2020 counting only the distinct ones).

The product of its (nonzero) digits is 16128, while the sum is 32.

The square root of 331784420 is about 18214.9504528560. The cubic root of 331784420 is about 692.2856500548.

The spelling of 331784420 in words is "three hundred thirty-one million, seven hundred eighty-four thousand, four hundred twenty".