81003968 has 28 divisors (see below), whose sum is σ = 161086800. Its totient is φ = 40415232.

The previous prime is 81003943. The next prime is 81003977. The reversal of 81003968 is 86930018.

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, 37280 + ... + 39392.

It is an arithmetic number, because the mean of its divisors is an integer number (5753100).

Almost surely, 2^81003968 is an apocalyptic number.

It is an amenable number.

81003968 is a deficient number, since it is larger than the sum of its proper divisors (80082832).

81003968 is a wasteful number, since it uses less digits than its factorization.

81003968 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2724 (or 2714 counting only the distinct ones).

The product of its (nonzero) digits is 10368, while the sum is 35.

The square root of 81003968 is about 9000.2204417447. The cubic root of 81003968 is about 432.6819362192.

The spelling of 81003968 in words is "eighty-one million, three thousand, nine hundred sixty-eight".