81203204 has 6 divisors (see below), whose sum is σ = 142105614. Its totient is φ = 40601600.

The previous prime is 81203173. The next prime is 81203257. The reversal of 81203204 is 40230218.

It can be written as a sum of positive squares in only one way, i.e., 81180100 + 23104 = 9010^2 + 152^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10150397 + ... + 10150404.

It is an arithmetic number, because the mean of its divisors is an integer number (23684269).

Almost surely, 2^81203204 is an apocalyptic number.

It is an amenable number.

81203204 is a deficient number, since it is larger than the sum of its proper divisors (60902410).

81203204 is a wasteful number, since it uses less digits than its factorization.

81203204 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20300805 (or 20300803 counting only the distinct ones).

The product of its (nonzero) digits is 384, while the sum is 20.

The square root of 81203204 is about 9011.2820397544. The cubic root of 81203204 is about 433.0363848550.

The spelling of 81203204 in words is "eighty-one million, two hundred three thousand, two hundred four".