81980296 has 16 divisors (see below), whose sum is σ = 153860940. Its totient is φ = 40950720.

The previous prime is 81980263. The next prime is 81980299. The reversal of 81980296 is 69208918.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 80748196 + 1232100 = 8986^2 + 1110^2 .

It is not an unprimeable number, because it can be changed into a prime (81980299) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5110 + ... + 13786.

Almost surely, 2^81980296 is an apocalyptic number.

It is an amenable number.

81980296 is a deficient number, since it is larger than the sum of its proper divisors (71880644).

81980296 is a wasteful number, since it uses less digits than its factorization.

81980296 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9864 (or 9860 counting only the distinct ones).

The product of its (nonzero) digits is 62208, while the sum is 43.

The square root of 81980296 is about 9054.2971013768. The cubic root of 81980296 is about 434.4133475522.

The spelling of 81980296 in words is "eighty-one million, nine hundred eighty thousand, two hundred ninety-six".