6463639 has 24 divisors (see below), whose sum is σ = 8267280. Its totient is φ = 5007744.

The previous prime is 6463637. The next prime is 6463643. The reversal of 6463639 is 9363646.

It is not a de Polignac number, because 6463639 - 2¹ = 6463637 is a prime.

It is a d-powerful number, because it can be written as 6 + 4⁵ + 6 + 3² + 6⁸ + 3¹⁴ + 9 .

It is a junction number, because it is equal to n+sod(n) for n = 6463598 and 6463607.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6463637) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 46432 + ... + 46570.

It is an arithmetic number, because the mean of its divisors is an integer number (344470).

Almost surely, 2^6463639 is an apocalyptic number.

6463639 is a deficient number, since it is larger than the sum of its proper divisors (1803641).

6463639 is a wasteful number, since it uses less digits than its factorization.

6463639 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 239 (or 232 counting only the distinct ones).

The product of its digits is 69984, while the sum is 37.

The square root of 6463639 is about 2542.3687773413. The cubic root of 6463639 is about 186.2769124662.

The spelling of 6463639 in words is "six million, four hundred sixty-three thousand, six hundred thirty-nine".