81273952 has 24 divisors (see below), whose sum is σ = 160548696. Its totient is φ = 40499712.

The previous prime is 81273949. The next prime is 81273967. The reversal of 81273952 is 25937218.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5688 + ... + 13960.

It is an arithmetic number, because the mean of its divisors is an integer number (6689529).

Almost surely, 2^81273952 is an apocalyptic number.

It is an amenable number.

81273952 is a deficient number, since it is larger than the sum of its proper divisors (79274744).

81273952 is a wasteful number, since it uses less digits than its factorization.

81273952 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8590 (or 8582 counting only the distinct ones).

The product of its digits is 30240, while the sum is 37.

The square root of 81273952 is about 9015.2067086673. The cubic root of 81273952 is about 433.1621088152.

The spelling of 81273952 in words is "eighty-one million, two hundred seventy-three thousand, nine hundred fifty-two".