3644239540 has 24 divisors (see below), whose sum is σ = 7665057792. Its totient is φ = 1455380640.

The previous prime is 3644239537. The next prime is 3644239541. The reversal of 3644239540 is 459324463.

It is a junction number, because it is equal to n+sod(n) for n = 3644239493 and 3644239502.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3644239541) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 131764 + ... + 157003.

It is an arithmetic number, because the mean of its divisors is an integer number (319377408).

Almost surely, 2^3644239540 is an apocalyptic number.

It is an amenable number.

3644239540 is an abundant number, since it is smaller than the sum of its proper divisors (4020818252).

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

3644239540 is a wasteful number, since it uses less digits than its factorization.

3644239540 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 289407 (or 289405 counting only the distinct ones).

The product of its (nonzero) digits is 311040, while the sum is 40.

The square root of 3644239540 is about 60367.5371371071. The cubic root of 3644239540 is about 1538.8713183669.

The spelling of 3644239540 in words is "three billion, six hundred forty-four million, two hundred thirty-nine thousand, five hundred forty".