87638389722 has 64 divisors (see below), whose sum is σ = 209870559360. Its totient is φ = 26947959552.

The previous prime is 87638389721. The next prime is 87638389771. The reversal of 87638389722 is 22798383678.

It is a self number, because there is not a number n which added to its sum of digits gives 87638389722.

It is not an unprimeable number, because it can be changed into a prime (87638389721) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1050013 + ... + 1130399.

It is an arithmetic number, because the mean of its divisors is an integer number (3279227490).

Almost surely, 2^87638389722 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 87638389722, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (104935279680).

87638389722 is an abundant number, since it is smaller than the sum of its proper divisors (122232169638).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

87638389722 is a wasteful number, since it uses less digits than its factorization.

87638389722 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 81964 (or 81958 counting only the distinct ones).

The product of its digits is 48771072, while the sum is 63.

The spelling of 87638389722 in words is "eighty-seven billion, six hundred thirty-eight million, three hundred eighty-nine thousand, seven hundred twenty-two".