3855507656 has 256 divisors, whose sum is σ = 10404495360. Its totient is φ = 1288949760.

The previous prime is 3855507599. The next prime is 3855507659. The reversal of 3855507656 is 6567055583.

It is a super-2 number, since 2×3855507656² = 29729878570949228672, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (3855507659) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 17289161 + ... + 17289383.

It is an arithmetic number, because the mean of its divisors is an integer number (40642560).

Almost surely, 2^3855507656 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 3855507656, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (5202247680).

3855507656 is an abundant number, since it is smaller than the sum of its proper divisors (6548987704).

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

3855507656 is a wasteful number, since it uses less digits than its factorization.

3855507656 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 404 (or 400 counting only the distinct ones).

The product of its (nonzero) digits is 3780000, while the sum is 50.

The square root of 3855507656 is about 62092.7343253621. The cubic root of 3855507656 is about 1568.0522258479.

The spelling of 3855507656 in words is "three billion, eight hundred fifty-five million, five hundred seven thousand, six hundred fifty-six".