81204488 has 8 divisors (see below), whose sum is σ = 152258430. Its totient is φ = 40602240.

The previous prime is 81204463. The next prime is 81204491. The reversal of 81204488 is 88440218.

It can be written as a sum of positive squares in only one way, i.e., 59320804 + 21883684 = 7702^2 + 4678^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5075273 + ... + 5075288.

Almost surely, 2^81204488 is an apocalyptic number.

It is an amenable number.

81204488 is a deficient number, since it is larger than the sum of its proper divisors (71053942).

81204488 is a wasteful number, since it uses less digits than its factorization.

81204488 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10150567 (or 10150563 counting only the distinct ones).

The product of its (nonzero) digits is 16384, while the sum is 35.

The square root of 81204488 is about 9011.3532834974. The cubic root of 81204488 is about 433.0386672600.

The spelling of 81204488 in words is "eighty-one million, two hundred four thousand, four hundred eighty-eight".