3121488720 has 480 divisors, whose sum is σ = 12966670080. Its totient is φ = 656916480.

The previous prime is 3121488719. The next prime is 3121488749. The reversal of 3121488720 is 278841213.

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 pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 3542680 + ... + 3543560.

It is an arithmetic number, because the mean of its divisors is an integer number (27013896).

Almost surely, 2^3121488720 is an apocalyptic number.

3121488720 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 3121488720, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (6483335040).

3121488720 is an abundant number, since it is smaller than the sum of its proper divisors (9845181360).

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

3121488720 is a wasteful number, since it uses less digits than its factorization.

3121488720 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 963 (or 954 counting only the distinct ones).

The product of its (nonzero) digits is 21504, while the sum is 36.

The square root of 3121488720 is about 55870.2847674862. The cubic root of 3121488720 is about 1461.4610881577.

The spelling of 3121488720 in words is "three billion, one hundred twenty-one million, four hundred eighty-eight thousand, seven hundred twenty".