2638450673 has 4 divisors (see below), whose sum is σ = 2661799908. Its totient is φ = 2615101440.

The previous prime is 2638450669. The next prime is 2638450679. The reversal of 2638450673 is 3760548362.

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

It can be written as a sum of positive squares in 2 ways, for example, as 28058209 + 2610392464 = 5297^2 + 51092^2 .

It is a cyclic number.

It is not a de Polignac number, because 2638450673 - 2² = 2638450669 is a prime.

It is a super-2 number, since 2×2638450673² = 13922843907708305858, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2638450679) 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, 11674448 + ... + 11674673.

It is an arithmetic number, because the mean of its divisors is an integer number (665449977).

Almost surely, 2^2638450673 is an apocalyptic number.

It is an amenable number.

2638450673 is a deficient number, since it is larger than the sum of its proper divisors (23349235).

2638450673 is a wasteful number, since it uses less digits than its factorization.

2638450673 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23349234.

The product of its (nonzero) digits is 725760, while the sum is 44.

The square root of 2638450673 is about 51365.8512340641. The cubic root of 2638450673 is about 1381.8142268001.

The spelling of 2638450673 in words is "two billion, six hundred thirty-eight million, four hundred fifty thousand, six hundred seventy-three".