81937888 has 24 divisors (see below), whose sum is σ = 161777952. Its totient is φ = 40851456.

The previous prime is 81937883. The next prime is 81937897. The reversal of 81937888 is 88873918.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81937883) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8256 + ... + 15232.

It is an arithmetic number, because the mean of its divisors is an integer number (6740748).

Almost surely, 2^81937888 is an apocalyptic number.

It is an amenable number.

81937888 is a deficient number, since it is larger than the sum of its proper divisors (79840064).

81937888 is a wasteful number, since it uses less digits than its factorization.

81937888 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7354 (or 7346 counting only the distinct ones).

The product of its digits is 774144, while the sum is 52.

The square root of 81937888 is about 9051.9549269757. The cubic root of 81937888 is about 434.3384280097.

The spelling of 81937888 in words is "eighty-one million, nine hundred thirty-seven thousand, eight hundred eighty-eight".