3638545840 has 20 divisors (see below), whose sum is σ = 8459619264. Its totient is φ = 1455418304.

The previous prime is 3638545777. The next prime is 3638545901. The reversal of 3638545840 is 485458363.

It is a tau number, because it is divible by the number of its divisors (20).

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 3 ways as a sum of consecutive naturals, for example, 22740832 + ... + 22740991.

Almost surely, 2^3638545840 is an apocalyptic number.

It is an amenable number.

3638545840 is an abundant number, since it is smaller than the sum of its proper divisors (4821073424).

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

3638545840 is a wasteful number, since it uses less digits than its factorization.

3638545840 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 45481836 (or 45481830 counting only the distinct ones).

The product of its (nonzero) digits is 1382400, while the sum is 46.

The square root of 3638545840 is about 60320.3600785009. The cubic root of 3638545840 is about 1538.0694648637.

The spelling of 3638545840 in words is "three billion, six hundred thirty-eight million, five hundred forty-five thousand, eight hundred forty".