2638873885 has 4 divisors (see below), whose sum is σ = 3166648668. Its totient is φ = 2111099104.

The previous prime is 2638873873. The next prime is 2638873931. The reversal of 2638873885 is 5883788362.

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 1652097316 + 986776569 = 40646^2 + 31413^2 .

It is a cyclic number.

It is not a de Polignac number, because 2638873885 - 2⁹ = 2638873373 is a prime.

It is a Smith number, since the sum of its digits (58) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 263887384 + ... + 263887393.

It is an arithmetic number, because the mean of its divisors is an integer number (791662167).

Almost surely, 2^2638873885 is an apocalyptic number.

It is an amenable number.

2638873885 is a deficient number, since it is larger than the sum of its proper divisors (527774783).

2638873885 is an equidigital number, since it uses as much as digits as its factorization.

2638873885 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 527774782.

The product of its digits is 15482880, while the sum is 58.

The square root of 2638873885 is about 51369.9706540699. The cubic root of 2638873885 is about 1381.8881046386. Note that the first 3 decimals are identical.

The spelling of 2638873885 in words is "two billion, six hundred thirty-eight million, eight hundred seventy-three thousand, eight hundred eighty-five".