2638628399 has 4 divisors (see below), whose sum is σ = 2878503720. Its totient is φ = 2398753080.

The previous prime is 2638628389. The next prime is 2638628411. The reversal of 2638628399 is 9938268362.

2638628399 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2638628399 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2638628359) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 119937644 + ... + 119937665.

It is an arithmetic number, because the mean of its divisors is an integer number (719625930).

Almost surely, 2^2638628399 is an apocalyptic number.

2638628399 is a deficient number, since it is larger than the sum of its proper divisors (239875321).

2638628399 is a wasteful number, since it uses less digits than its factorization.

2638628399 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 239875320.

The product of its digits is 6718464, while the sum is 56.

The square root of 2638628399 is about 51367.5812064380. The cubic root of 2638628399 is about 1381.8452524324.

The spelling of 2638628399 in words is "two billion, six hundred thirty-eight million, six hundred twenty-eight thousand, three hundred ninety-nine".