2638537889828 has 6 divisors (see below), whose sum is σ = 4617441307206. Its totient is φ = 1319268944912.

The previous prime is 2638537889809. The next prime is 2638537889899. The reversal of 2638537889828 is 8289887358362.

It can be written as a sum of positive squares in only one way, i.e., 1699638904804 + 938898985024 = 1303702^2 + 968968^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 329817236225 + ... + 329817236232.

It is an arithmetic number, because the mean of its divisors is an integer number (769573551201).

Almost surely, 2^{2638537889828} is an apocalyptic number.

It is an amenable number.

2638537889828 is a deficient number, since it is larger than the sum of its proper divisors (1978903417378).

2638537889828 is a wasteful number, since it uses less digits than its factorization.

2638537889828 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 659634472461 (or 659634472459 counting only the distinct ones).

The product of its digits is 2229534720, while the sum is 77.

The spelling of 2638537889828 in words is "two trillion, six hundred thirty-eight billion, five hundred thirty-seven million, eight hundred eighty-nine thousand, eight hundred twenty-eight".