2638967645 has 8 divisors (see below), whose sum is σ = 3168146520. Its totient is φ = 2110250560.

The previous prime is 2638967603. The next prime is 2638967651. The reversal of 2638967645 is 5467698362.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 489161689 + 2149805956 = 22117^2 + 46366^2 .

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

It is not a de Polignac number, because 2638967645 - 2¹⁴ = 2638951261 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 102746 + ... + 125835.

It is an arithmetic number, because the mean of its divisors is an integer number (396018315).

Almost surely, 2^2638967645 is an apocalyptic number.

It is an amenable number.

2638967645 is a deficient number, since it is larger than the sum of its proper divisors (529178875).

2638967645 is a wasteful number, since it uses less digits than its factorization.

2638967645 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 230895.

The product of its digits is 13063680, while the sum is 56.

The square root of 2638967645 is about 51370.8832413849. The cubic root of 2638967645 is about 1381.9044707477.

The spelling of 2638967645 in words is "two billion, six hundred thirty-eight million, nine hundred sixty-seven thousand, six hundred forty-five".