81037928 has 16 divisors (see below), whose sum is σ = 153422880. Its totient is φ = 40125168.

The previous prime is 81037897. The next prime is 81037981. The reversal of 81037928 is 82973018.

It is a super-5 number, since 5×81037928⁵ (a number of 41 digits) contains 55555 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 81037891 and 81037900.

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, 48350 + ... + 49997.

It is an arithmetic number, because the mean of its divisors is an integer number (9588930).

Almost surely, 2^81037928 is an apocalyptic number.

It is an amenable number.

81037928 is a deficient number, since it is larger than the sum of its proper divisors (72384952).

81037928 is a wasteful number, since it uses less digits than its factorization.

81037928 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 98456 (or 98452 counting only the distinct ones).

The product of its (nonzero) digits is 24192, while the sum is 38.

The square root of 81037928 is about 9002.1068645068. The cubic root of 81037928 is about 432.7423934453.

The spelling of 81037928 in words is "eighty-one million, thirty-seven thousand, nine hundred twenty-eight".