87721422 has 16 divisors (see below), whose sum is σ = 175536720. Its totient is φ = 29224832.

The previous prime is 87721409. The next prime is 87721453. The reversal of 87721422 is 22412778.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 16168 + ... + 20900.

It is an arithmetic number, because the mean of its divisors is an integer number (10971045).

Almost surely, 2^87721422 is an apocalyptic number.

87721422 is an abundant number, since it is smaller than the sum of its proper divisors (87815298).

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

87721422 is a wasteful number, since it uses less digits than its factorization.

87721422 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7827.

The product of its digits is 12544, while the sum is 33.

The square root of 87721422 is about 9365.9714925895. The cubic root of 87721422 is about 444.3261644462.

The spelling of 87721422 in words is "eighty-seven million, seven hundred twenty-one thousand, four hundred twenty-two".