3121765640 has 32 divisors (see below), whose sum is σ = 8027398080. Its totient is φ = 1070319552.

The previous prime is 3121765631. The next prime is 3121765651. The reversal of 3121765640 is 465671213.

It is a super-2 number, since 2×3121765640² = 19490841422169219200, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (35).

It is a self number, because there is not a number n which added to its sum of digits gives 3121765640.

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 7 ways as a sum of consecutive naturals, for example, 5574302 + ... + 5574861.

It is an arithmetic number, because the mean of its divisors is an integer number (250856190).

Almost surely, 2^3121765640 is an apocalyptic number.

It is an amenable number.

3121765640 is an abundant number, since it is smaller than the sum of its proper divisors (4905632440).

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

3121765640 is a wasteful number, since it uses less digits than its factorization.

3121765640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11149181 (or 11149177 counting only the distinct ones).

The product of its (nonzero) digits is 30240, while the sum is 35.

The square root of 3121765640 is about 55872.7629529809. The cubic root of 3121765640 is about 1461.5043042717.

The spelling of 3121765640 in words is "three billion, one hundred twenty-one million, seven hundred sixty-five thousand, six hundred forty".