3640404444 has 12 divisors (see below), whose sum is σ = 8494277064. Its totient is φ = 1213468144.

The previous prime is 3640404437. The next prime is 3640404461. The reversal of 3640404444 is 4444040463.

It is a tau number, because it is divible by the number of its divisors (12).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 151683507 + ... + 151683530.

It is an arithmetic number, because the mean of its divisors is an integer number (707856422).

Almost surely, 2^3640404444 is an apocalyptic number.

It is an amenable number.

3640404444 is an abundant number, since it is smaller than the sum of its proper divisors (4853872620).

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

3640404444 is a wasteful number, since it uses less digits than its factorization.

3640404444 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 303367044 (or 303367042 counting only the distinct ones).

The product of its (nonzero) digits is 73728, while the sum is 33.

The square root of 3640404444 is about 60335.7642199053. The cubic root of 3640404444 is about 1538.3313071472.

The spelling of 3640404444 in words is "three billion, six hundred forty million, four hundred four thousand, four hundred forty-four".