87722057772 has 18 divisors (see below), whose sum is σ = 221741868348. Its totient is φ = 29240685912.

The previous prime is 87722057729. The next prime is 87722057777. The reversal of 87722057772 is 27775022778.

It is a tau number, because it is divible by the number of its divisors (18).

It is a Smith number, since the sum of its digits (54) coincides with the sum of the digits of its prime factors.

It is not an unprimeable number, because it can be changed into a prime (87722057777) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1218361878 + ... + 1218361949.

It is an arithmetic number, because the mean of its divisors is an integer number (12318992686).

Almost surely, 2^87722057772 is an apocalyptic number.

It is an amenable number.

87722057772 is an abundant number, since it is smaller than the sum of its proper divisors (134019810576).

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

87722057772 is a wasteful number, since it uses less digits than its factorization.

87722057772 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2436723837 (or 2436723832 counting only the distinct ones).

The product of its (nonzero) digits is 5378240, while the sum is 54.

The spelling of 87722057772 in words is "eighty-seven billion, seven hundred twenty-two million, fifty-seven thousand, seven hundred seventy-two".