71720442 has 24 divisors (see below), whose sum is σ = 157000116. Its totient is φ = 23659776.

The previous prime is 71720413. The next prime is 71720443. The reversal of 71720442 is 24402717.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 67716441 + 4004001 = 8229^2 + 2001^2 .

It is not an unprimeable number, because it can be changed into a prime (71720443) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 18793 + ... + 22284.

Almost surely, 2^71720442 is an apocalyptic number.

71720442 is an abundant number, since it is smaller than the sum of its proper divisors (85279674).

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

71720442 is a wasteful number, since it uses less digits than its factorization.

71720442 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 41182 (or 41179 counting only the distinct ones).

The product of its (nonzero) digits is 3136, while the sum is 27.

The square root of 71720442 is about 8468.7922397471. The cubic root of 71720442 is about 415.4776365431.

The spelling of 71720442 in words is "seventy-one million, seven hundred twenty thousand, four hundred forty-two".