81884004 has 24 divisors (see below), whose sum is σ = 191230368. Its totient is φ = 27270720.

The previous prime is 81883999. The next prime is 81884009. The reversal of 81884004 is 40048818.

It is an interprime number because it is at equal distance from previous prime (81883999) and next prime (81884009).

It is a super-2 number, since 2×81884004² = 13409980222144032, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (81884009) 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, 16144 + ... + 20600.

It is an arithmetic number, because the mean of its divisors is an integer number (7967932).

Almost surely, 2^81884004 is an apocalyptic number.

It is an amenable number.

81884004 is an abundant number, since it is smaller than the sum of its proper divisors (109346364).

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

81884004 is a wasteful number, since it uses less digits than its factorization.

81884004 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5995 (or 5993 counting only the distinct ones).

The product of its (nonzero) digits is 8192, while the sum is 33.

The square root of 81884004 is about 9048.9780638479. The cubic root of 81884004 is about 434.2431972417.

The spelling of 81884004 in words is "eighty-one million, eight hundred eighty-four thousand, four".