81437882 has 8 divisors (see below), whose sum is σ = 122195136. Its totient is φ = 40706172.

The previous prime is 81437843. The next prime is 81437891. The reversal of 81437882 is 28873418.

It is a sphenic number, since it is the product of 3 distinct primes.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 9023 + ... + 15629.

It is an arithmetic number, because the mean of its divisors is an integer number (15274392).

Almost surely, 2^81437882 is an apocalyptic number.

81437882 is a deficient number, since it is larger than the sum of its proper divisors (40757254).

81437882 is a wasteful number, since it uses less digits than its factorization.

81437882 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12772.

The product of its digits is 86016, while the sum is 41.

The square root of 81437882 is about 9024.2939890055. The cubic root of 81437882 is about 433.4531433342.

The spelling of 81437882 in words is "eighty-one million, four hundred thirty-seven thousand, eight hundred eighty-two".