81782023 has 12 divisors (see below), whose sum is σ = 87206328. Its totient is φ = 76676400.

The previous prime is 81781991. The next prime is 81782027. The reversal of 81782023 is 32028718.

It is not a de Polignac number, because 81782023 - 2⁵ = 81781991 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81782027) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 35340 + ... + 37582.

It is an arithmetic number, because the mean of its divisors is an integer number (7267194).

Almost surely, 2^81782023 is an apocalyptic number.

81782023 is a deficient number, since it is larger than the sum of its proper divisors (5424305).

81782023 is a wasteful number, since it uses less digits than its factorization.

81782023 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2382 (or 2363 counting only the distinct ones).

The product of its (nonzero) digits is 5376, while the sum is 31.

The square root of 81782023 is about 9043.3413625717. The cubic root of 81782023 is about 434.0628488198.

It can be divided in two parts, 8178 and 2023, that added together give a palindrome (10201).

The spelling of 81782023 in words is "eighty-one million, seven hundred eighty-two thousand, twenty-three".