3621643700 has 54 divisors (see below), whose sum is σ = 8010668274. Its totient is φ = 1421214080.

The previous prime is 3621643691. The next prime is 3621643709. The reversal of 3621643700 is 73461263.

It is an interprime number because it is at equal distance from previous prime (3621643691) and next prime (3621643709).

It can be written as a sum of positive squares in 9 ways, for example, as 229280164 + 3392363536 = 15142^2 + 58244^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3621643709) by changing a digit.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 274454 + ... + 287346.

Almost surely, 2^3621643700 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 3621643700, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (4005334137).

3621643700 is an abundant number, since it is smaller than the sum of its proper divisors (4389024574).

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

3621643700 is a wasteful number, since it uses less digits than its factorization.

3621643700 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13013 (or 12953 counting only the distinct ones).

The product of its (nonzero) digits is 18144, while the sum is 32.

The square root of 3621643700 is about 60180.0938849384. The cubic root of 3621643700 is about 1535.6841691176.

The spelling of 3621643700 in words is "three billion, six hundred twenty-one million, six hundred forty-three thousand, seven hundred".