81881762 has 8 divisors (see below), whose sum is σ = 124377600. Its totient is φ = 40422564.

The previous prime is 81881759. The next prime is 81881783. The reversal of 81881762 is 26718818.

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, 258962 + ... + 259277.

It is an arithmetic number, because the mean of its divisors is an integer number (15547200).

Almost surely, 2^81881762 is an apocalyptic number.

81881762 is a deficient number, since it is larger than the sum of its proper divisors (42495838).

81881762 is a wasteful number, since it uses less digits than its factorization.

81881762 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 518320.

The product of its digits is 43008, while the sum is 41.

The square root of 81881762 is about 9048.8541816077. The cubic root of 81881762 is about 434.2392339844.

The spelling of 81881762 in words is "eighty-one million, eight hundred eighty-one thousand, seven hundred sixty-two".