3951620556 has 96 divisors (see below), whose sum is σ = 10618630848. Its totient is φ = 1132953600.

The previous prime is 3951620489. The next prime is 3951620663. The reversal of 3951620556 is 6550261593.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 260476 + ... + 275228.

It is an arithmetic number, because the mean of its divisors is an integer number (110610738).

Almost surely, 2^3951620556 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 3951620556, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (5309315424).

3951620556 is an abundant number, since it is smaller than the sum of its proper divisors (6667010292).

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

3951620556 is a wasteful number, since it uses less digits than its factorization.

3951620556 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14891 (or 14889 counting only the distinct ones).

The product of its (nonzero) digits is 243000, while the sum is 42.

The square root of 3951620556 is about 62861.9165791181. The cubic root of 3951620556 is about 1580.9752772722.

The spelling of 3951620556 in words is "three billion, nine hundred fifty-one million, six hundred twenty thousand, five hundred fifty-six".