5643639 has 6 divisors (see below), whose sum is σ = 8151936. Its totient is φ = 3762420.

The previous prime is 5643623. The next prime is 5643641. The reversal of 5643639 is 9363465.

5643639 is a `hidden beast` number, since 5 + 643 + 6 + 3 + 9 = 666.

It is not a de Polignac number, because 5643639 - 2⁴ = 5643623 is a prime.

It is a super-2 number, since 2×5643639² = 63701322324642, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (5645639) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 313527 + ... + 313544.

It is an arithmetic number, because the mean of its divisors is an integer number (1358656).

Almost surely, 2^5643639 is an apocalyptic number.

5643639 is a deficient number, since it is larger than the sum of its proper divisors (2508297).

5643639 is a wasteful number, since it uses less digits than its factorization.

5643639 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 627077 (or 627074 counting only the distinct ones).

The product of its digits is 58320, while the sum is 36.

The square root of 5643639 is about 2375.6344415756. The cubic root of 5643639 is about 178.0408840145.

The spelling of 5643639 in words is "five million, six hundred forty-three thousand, six hundred thirty-nine".