81203308 has 12 divisors (see below), whose sum is σ = 145946752. Its totient is φ = 39504240.

The previous prime is 81203303. The next prime is 81203323. The reversal of 81203308 is 80330218.

It is not an unprimeable number, because it can be changed into a prime (81203303) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 274188 + ... + 274483.

Almost surely, 2^81203308 is an apocalyptic number.

It is an amenable number.

81203308 is a deficient number, since it is larger than the sum of its proper divisors (64743444).

81203308 is a wasteful number, since it uses less digits than its factorization.

81203308 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 548712 (or 548710 counting only the distinct ones).

The product of its (nonzero) digits is 1152, while the sum is 25.

The square root of 81203308 is about 9011.2878102966. The cubic root of 81203308 is about 433.0365697236.

The spelling of 81203308 in words is "eighty-one million, two hundred three thousand, three hundred eight".