3121087860 has 144 divisors (see below), whose sum is σ = 10430888832. Its totient is φ = 749088000.

The previous prime is 3121087859. The next prime is 3121087897. The reversal of 3121087860 is 687801213.

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 47 ways as a sum of consecutive naturals, for example, 192177 + ... + 207783.

It is an arithmetic number, because the mean of its divisors is an integer number (72436728).

Almost surely, 2^3121087860 is an apocalyptic number.

3121087860 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 3121087860, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (5215444416).

3121087860 is an abundant number, since it is smaller than the sum of its proper divisors (7309800972).

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

3121087860 is a wasteful number, since it uses less digits than its factorization.

3121087860 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15734 (or 15729 counting only the distinct ones).

The product of its (nonzero) digits is 16128, while the sum is 36.

The square root of 3121087860 is about 55866.6972354729. The cubic root of 3121087860 is about 1461.3985254487.

The spelling of 3121087860 in words is "three billion, one hundred twenty-one million, eighty-seven thousand, eight hundred sixty".