3645840436 has 96 divisors (see below), whose sum is σ = 7861274624. Its totient is φ = 1446336000.

The previous prime is 3645840413. The next prime is 3645840461. The reversal of 3645840436 is 6340485463.

3645840436 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a junction number, because it is equal to n+sod(n) for n = 3645840392 and 3645840401.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1958146 + ... + 1960006.

Almost surely, 2^3645840436 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 3645840436, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3930637312).

3645840436 is an abundant number, since it is smaller than the sum of its proper divisors (4215434188).

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

3645840436 is a wasteful number, since it uses less digits than its factorization.

3645840436 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2001 (or 1999 counting only the distinct ones).

The product of its (nonzero) digits is 829440, while the sum is 43.

The square root of 3645840436 is about 60380.7952580951. The cubic root of 3645840436 is about 1539.0966248407.

The spelling of 3645840436 in words is "three billion, six hundred forty-five million, eight hundred forty thousand, four hundred thirty-six".