81304472 has 16 divisors (see below), whose sum is σ = 161413560. Its totient is φ = 38260864.

The previous prime is 81304469. The next prime is 81304481. The reversal of 81304472 is 27440318.

It is a super-2 number, since 2×81304472² = 13220834334397568, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

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, 298778 + ... + 299049.

Almost surely, 2^81304472 is an apocalyptic number.

It is an amenable number.

81304472 is a deficient number, since it is larger than the sum of its proper divisors (80109088).

81304472 is a wasteful number, since it uses less digits than its factorization.

81304472 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 597850 (or 597846 counting only the distinct ones).

The product of its (nonzero) digits is 5376, while the sum is 29.

The square root of 81304472 is about 9016.8992453060. The cubic root of 81304472 is about 433.2163223846.

The spelling of 81304472 in words is "eighty-one million, three hundred four thousand, four hundred seventy-two".