71990082 has 12 divisors (see below), whose sum is σ = 155978550. Its totient is φ = 23996688.

The previous prime is 71990081. The next prime is 71990101. The reversal of 71990082 is 28009917.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 58660281 + 13329801 = 7659^2 + 3651^2 .

It is not an unprimeable number, because it can be changed into a prime (71990081) 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, 1999707 + ... + 1999742.

Almost surely, 2^71990082 is an apocalyptic number.

71990082 is an abundant number, since it is smaller than the sum of its proper divisors (83988468).

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

71990082 is a wasteful number, since it uses less digits than its factorization.

71990082 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3999457 (or 3999454 counting only the distinct ones).

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

The square root of 71990082 is about 8484.6969303564. The cubic root of 71990082 is about 415.9976616301.

Adding to 71990082 its reverse (28009917), we get a palindrome (99999999).

The spelling of 71990082 in words is "seventy-one million, nine hundred ninety thousand, eighty-two".