3121285860 has 384 divisors, whose sum is σ = 12195348480. Its totient is φ = 643852800.

The previous prime is 3121285847. The next prime is 3121285877. The reversal of 3121285860 is 685821213.

It is a happy number.

3121285860 is a `hidden beast` number, since 31 + 21 + 28 + 586 + 0 = 666.

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

It is an unprimeable number.

It is a polite number, since it can be written in 127 ways as a sum of consecutive naturals, for example, 11268042 + ... + 11268318.

It is an arithmetic number, because the mean of its divisors is an integer number (31758720).

Almost surely, 2^3121285860 is an apocalyptic number.

3121285860 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 3121285860, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (6097674240).

3121285860 is an abundant number, since it is smaller than the sum of its proper divisors (9074062620).

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

3121285860 is a wasteful number, since it uses less digits than its factorization.

3121285860 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 584 (or 576 counting only the distinct ones).

The product of its (nonzero) digits is 23040, while the sum is 36.

The square root of 3121285860 is about 55868.4692827717. The cubic root of 3121285860 is about 1461.4294282196.

The spelling of 3121285860 in words is "three billion, one hundred twenty-one million, two hundred eighty-five thousand, eight hundred sixty".