81272476 has 6 divisors (see below), whose sum is σ = 142226840. Its totient is φ = 40636236.

The previous prime is 81272453. The next prime is 81272489. The reversal of 81272476 is 67427218.

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 as a sum of consecutive naturals, namely, 10159056 + ... + 10159063.

Almost surely, 2^81272476 is an apocalyptic number.

It is an amenable number.

81272476 is a deficient number, since it is larger than the sum of its proper divisors (60954364).

81272476 is a wasteful number, since it uses less digits than its factorization.

81272476 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20318123 (or 20318121 counting only the distinct ones).

The product of its digits is 37632, while the sum is 37.

The square root of 81272476 is about 9015.1248466119. The cubic root of 81272476 is about 433.1594866092.

The spelling of 81272476 in words is "eighty-one million, two hundred seventy-two thousand, four hundred seventy-six".