3609209856 has 132 divisors (see below), whose sum is σ = 11190916248. Its totient is φ = 1031159808.

The previous prime is 3609209833. The next prime is 3609209893. The reversal of 3609209856 is 6589029063.

It is a Harshad number since it is a multiple of its sum of digits (48).

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 138540 + ... + 162516.

Almost surely, 2^3609209856 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 3609209856, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (5595458124).

3609209856 is an abundant number, since it is smaller than the sum of its proper divisors (7581706392).

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

3609209856 is a wasteful number, since it uses less digits than its factorization.

3609209856 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24014 (or 23989 counting only the distinct ones).

The product of its (nonzero) digits is 699840, while the sum is 48.

The square root of 3609209856 is about 60076.6997762028. The cubic root of 3609209856 is about 1533.9247147118.

The spelling of 3609209856 in words is "three billion, six hundred nine million, two hundred nine thousand, eight hundred fifty-six".