2638443634 has 8 divisors (see below), whose sum is σ = 3963654828. Its totient is φ = 1317225360.

The previous prime is 2638443629. The next prime is 2638443637. The reversal of 2638443634 is 4363448362.

2638443634 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 2 ways, for example, as 2550553009 + 87890625 = 50503^2 + 9375^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a super-2 number, since 2×2638443634² = 13922769619590251912, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (2638443637) 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, 996577 + ... + 999220.

Almost surely, 2^2638443634 is an apocalyptic number.

2638443634 is a deficient number, since it is larger than the sum of its proper divisors (1325211194).

2638443634 is a wasteful number, since it uses less digits than its factorization.

2638443634 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1996460.

The product of its digits is 995328, while the sum is 43.

The square root of 2638443634 is about 51365.7827157340. The cubic root of 2638443634 is about 1381.8129979730.

The spelling of 2638443634 in words is "two billion, six hundred thirty-eight million, four hundred forty-three thousand, six hundred thirty-four".