71998020 has 36 divisors (see below), whose sum is σ = 218394540. Its totient is φ = 19199424.

The previous prime is 71998019. The next prime is 71998051. The reversal of 71998020 is 2089917.

It is a happy number.

71998020 is nontrivially palindromic in base 16.

It can be written as a sum of positive squares in 2 ways, for example, as 39917124 + 32080896 = 6318^2 + 5664^2 .

It is a tau number, because it is divible by the number of its divisors (36).

It is a Harshad number since it is a multiple of its sum of digits (36).

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 199815 + ... + 200174.

It is an arithmetic number, because the mean of its divisors is an integer number (6066515).

Almost surely, 2^71998020 is an apocalyptic number.

It is an amenable number.

71998020 is an abundant number, since it is smaller than the sum of its proper divisors (146396520).

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

71998020 is a wasteful number, since it uses less digits than its factorization.

71998020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 400004 (or 399999 counting only the distinct ones).

The product of its (nonzero) digits is 9072, while the sum is 36.

The square root of 71998020 is about 8485.1647008175. The cubic root of 71998020 is about 416.0129510884.

The spelling of 71998020 in words is "seventy-one million, nine hundred ninety-eight thousand, twenty".