81297896 has 16 divisors (see below), whose sum is σ = 153044640. Its totient is φ = 40486000.

The previous prime is 81297889. The next prime is 81297901. The reversal of 81297896 is 69879218.

It is a super-3 number, since 3×81297896³ (a number of 25 digits) contains 333 as substring.

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 in 3 ways as a sum of consecutive naturals, for example, 18236 + ... + 22251.

It is an arithmetic number, because the mean of its divisors is an integer number (9565290).

Almost surely, 2^81297896 is an apocalyptic number.

It is an amenable number.

81297896 is a deficient number, since it is larger than the sum of its proper divisors (71746744).

81297896 is a wasteful number, since it uses less digits than its factorization.

81297896 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 40744 (or 40740 counting only the distinct ones).

The product of its digits is 435456, while the sum is 50.

The square root of 81297896 is about 9016.5345892976. The cubic root of 81297896 is about 433.2046423901.

The spelling of 81297896 in words is "eighty-one million, two hundred ninety-seven thousand, eight hundred ninety-six".