3129775616 has 160 divisors (see below), whose sum is σ = 7319344032. Its totient is φ = 1321205760.

The previous prime is 3129775601. The next prime is 3129775619. The reversal of 3129775616 is 6165779213.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3129775619) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 9287000 + ... + 9287336.

Almost surely, 2^3129775616 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 3129775616, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3659672016).

3129775616 is an abundant number, since it is smaller than the sum of its proper divisors (4189568416).

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

3129775616 is a wasteful number, since it uses less digits than its factorization.

3129775616 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 480 (or 464 counting only the distinct ones).

The product of its digits is 476280, while the sum is 47.

The square root of 3129775616 is about 55944.3975389851. The cubic root of 3129775616 is about 1462.7532359697.

The spelling of 3129775616 in words is "three billion, one hundred twenty-nine million, seven hundred seventy-five thousand, six hundred sixteen".