81023976 has 128 divisors (see below), whose sum is σ = 249148800. Its totient is φ = 24494400.

The previous prime is 81023953. The next prime is 81024001. The reversal of 81023976 is 67932018.

It is a Smith number, since the sum of its digits (36) coincides with the sum of the digits of its prime factors.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a self number, because there is not a number n which added to its sum of digits gives 81023976.

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 in 31 ways as a sum of consecutive naturals, for example, 192246 + ... + 192666.

It is an arithmetic number, because the mean of its divisors is an integer number (1946475).

Almost surely, 2^81023976 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 81023976, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (124574400).

81023976 is an abundant number, since it is smaller than the sum of its proper divisors (168124824).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

81023976 is a wasteful number, since it uses less digits than its factorization.

81023976 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 459 (or 437 counting only the distinct ones).

The product of its (nonzero) digits is 18144, while the sum is 36.

The square root of 81023976 is about 9001.3319014466. The cubic root of 81023976 is about 432.7175574681.

The spelling of 81023976 in words is "eighty-one million, twenty-three thousand, nine hundred seventy-six".