331866720 has 240 divisors, whose sum is σ = 1212971760. Its totient is φ = 85349376.

The previous prime is 331866713. The next prime is 331866737. The reversal of 331866720 is 27668133.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (240).

It is a super-2 number, since 2×331866720² = 220271039687116800, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 375399 + ... + 376281.

It is an arithmetic number, because the mean of its divisors is an integer number (5054049).

Almost surely, 2^331866720 is an apocalyptic number.

331866720 is a gapful number since it is divisible by the number (30) 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 331866720, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (606485880).

331866720 is an abundant number, since it is smaller than the sum of its proper divisors (881105040).

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

331866720 is a wasteful number, since it uses less digits than its factorization.

331866720 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 939 (or 922 counting only the distinct ones).

The product of its (nonzero) digits is 36288, while the sum is 36.

The square root of 331866720 is about 18217.2094460156. The cubic root of 331866720 is about 692.3428864160.

The spelling of 331866720 in words is "three hundred thirty-one million, eight hundred sixty-six thousand, seven hundred twenty".