81884742 has 16 divisors (see below), whose sum is σ = 163918080. Its totient is φ = 27270152.

The previous prime is 81884741. The next prime is 81884809. The reversal of 81884742 is 24748818.

It is a super-2 number, since 2×81884742² = 13410221944813128, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 81884694 and 81884703.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81884741) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 1759 + ... + 12917.

It is an arithmetic number, because the mean of its divisors is an integer number (10244880).

Almost surely, 2^81884742 is an apocalyptic number.

81884742 is an abundant number, since it is smaller than the sum of its proper divisors (82033338).

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

81884742 is a wasteful number, since it uses less digits than its factorization.

81884742 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12387.

The product of its digits is 114688, while the sum is 42.

The square root of 81884742 is about 9049.0188418414. The cubic root of 81884742 is about 434.2445018128.

The spelling of 81884742 in words is "eighty-one million, eight hundred eighty-four thousand, seven hundred forty-two".