3621435620 has 72 divisors (see below), whose sum is σ = 8436535800. Its totient is φ = 1304709120.

The previous prime is 3621435553. The next prime is 3621435637. The reversal of 3621435620 is 265341263.

It can be written as a sum of positive squares in 4 ways, for example, as 439573156 + 3181862464 = 20966^2 + 56408^2 .

It is a super-2 number, since 2×3621435620² = 26229591899609568800, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 256916 + ... + 270644.

Almost surely, 2^3621435620 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 3621435620, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (4218267900).

3621435620 is an abundant number, since it is smaller than the sum of its proper divisors (4815100180).

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

3621435620 is a wasteful number, since it uses less digits than its factorization.

3621435620 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13869 (or 13856 counting only the distinct ones).

The product of its (nonzero) digits is 25920, while the sum is 32.

The square root of 3621435620 is about 60178.3650492434. The cubic root of 3621435620 is about 1535.6547578605.

Adding to 3621435620 its reverse (265341263), we get a palindrome (3886776883).

It can be divided in two parts, 362143 and 5620, that added together give a palindrome (367763).

The spelling of 3621435620 in words is "three billion, six hundred twenty-one million, four hundred thirty-five thousand, six hundred twenty".