71998180 has 24 divisors (see below), whose sum is σ = 152039160. Its totient is φ = 28638720.

The previous prime is 71998177. The next prime is 71998187. The reversal of 71998180 is 8189917.

71998180 is digitally balanced in base 9, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 4 ways, for example, as 4528384 + 67469796 = 2128^2 + 8214^2 .

71998180 is strictly pandigital in base 9.

It is not an unprimeable number, because it can be changed into a prime (71998187) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6325 + ... + 13564.

It is an arithmetic number, because the mean of its divisors is an integer number (6334965).

Almost surely, 2^71998180 is an apocalyptic number.

It is an amenable number.

71998180 is an abundant number, since it is smaller than the sum of its proper divisors (80040980).

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

71998180 is a wasteful number, since it uses less digits than its factorization.

71998180 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20079 (or 20077 counting only the distinct ones).

The product of its (nonzero) digits is 36288, while the sum is 43.

The square root of 71998180 is about 8485.1741290324. The cubic root of 71998180 is about 416.0132592544.

The spelling of 71998180 in words is "seventy-one million, nine hundred ninety-eight thousand, one hundred eighty".