87838732821 has 64 divisors (see below), whose sum is σ = 138276827136. Its totient is φ = 48565440000.

The previous prime is 87838732801. The next prime is 87838732831. The reversal of 87838732821 is 12823783878.

It is not a de Polignac number, because 87838732821 - 2¹⁴ = 87838716437 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (87838732801) by changing a digit.

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 in 63 ways as a sum of consecutive naturals, for example, 29268321 + ... + 29271321.

It is an arithmetic number, because the mean of its divisors is an integer number (2160575424).

Almost surely, 2^87838732821 is an apocalyptic number.

It is an amenable number.

87838732821 is a deficient number, since it is larger than the sum of its proper divisors (50438094315).

87838732821 is a wasteful number, since it uses less digits than its factorization.

87838732821 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3442.

The product of its digits is 7225344, while the sum is 57.

The spelling of 87838732821 in words is "eighty-seven billion, eight hundred thirty-eight million, seven hundred thirty-two thousand, eight hundred twenty-one".