5638958649 has 9 divisors (see below), whose sum is σ = 8145487909. Its totient is φ = 3759155580.

The previous prime is 5638958629. The next prime is 5638958651. The reversal of 5638958649 is 9468598365.

The square root of 5638958649 is 75093.

It is a perfect power (a square), and thus also a powerful number.

5638958649 is a `hidden beast` number, since 5 + 6 + 3 + 8 + 9 + 586 + 49 = 666.

5638958649 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a tau number, because it is divible by the number of its divisors (9).

It is not a de Polignac number, because 5638958649 - 2⁹ = 5638958137 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (5638958629) by changing a digit.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 212764 + ... + 237794.

Almost surely, 2^5638958649 is an apocalyptic number.

5638958649 is the 75093-rd square number.

5638958649 is the 37547-th centered octagonal number.

It is an amenable number.

5638958649 is a deficient number, since it is larger than the sum of its proper divisors (2506529260).

5638958649 is an frugal number, since it uses more digits than its factorization.

5638958649 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 50068 (or 25034 counting only the distinct ones).

The product of its digits is 55987200, while the sum is 63.

The cubic root of 5638958649 is about 1779.9165311405.

The spelling of 5638958649 in words is "five billion, six hundred thirty-eight million, nine hundred fifty-eight thousand, six hundred forty-nine".