81024382 has 4 divisors (see below), whose sum is σ = 121536576. Its totient is φ = 40512190.

The previous prime is 81024371. The next prime is 81024401. The reversal of 81024382 is 28342018.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 28342018 = 2 ⋅14171009.

It is a self number, because there is not a number n which added to its sum of digits gives 81024382.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20256094 + ... + 20256097.

It is an arithmetic number, because the mean of its divisors is an integer number (30384144).

Almost surely, 2^81024382 is an apocalyptic number.

81024382 is a deficient number, since it is larger than the sum of its proper divisors (40512194).

81024382 is a wasteful number, since it uses less digits than its factorization.

81024382 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 40512193.

The product of its (nonzero) digits is 3072, while the sum is 28.

The square root of 81024382 is about 9001.3544536364. The cubic root of 81024382 is about 432.7182802296.

It can be divided in two parts, 81024 and 382, that added together give a triangular number (81406 = T₄₀₃).

The spelling of 81024382 in words is "eighty-one million, twenty-four thousand, three hundred eighty-two".