3111646640 has 80 divisors (see below), whose sum is σ = 7509430080. Its totient is φ = 1197665280.

The previous prime is 3111646627. The next prime is 3111646667. The reversal of 3111646640 is 466461113.

It is a tau number, because it is divible by the number of its divisors (80).

It is a junction number, because it is equal to n+sod(n) for n = 3111646597 and 3111646606.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 733325 + ... + 737555.

It is an arithmetic number, because the mean of its divisors is an integer number (93867876).

Almost surely, 2^3111646640 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 3111646640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3754715040).

3111646640 is an abundant number, since it is smaller than the sum of its proper divisors (4397783440).

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

3111646640 is a wasteful number, since it uses less digits than its factorization.

3111646640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4590 (or 4584 counting only the distinct ones).

The product of its (nonzero) digits is 10368, while the sum is 32.

The square root of 3111646640 is about 55782.1354915711. The cubic root of 3111646640 is about 1459.9234713124.

The spelling of 3111646640 in words is "three billion, one hundred eleven million, six hundred forty-six thousand, six hundred forty".