81281882 has 8 divisors (see below), whose sum is σ = 133006752. Its totient is φ = 36946300.

The previous prime is 81281873. The next prime is 81281891. The reversal of 81281882 is 28818218.

It is an interprime number because it is at equal distance from previous prime (81281873) and next prime (81281891).

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, 1847294 + ... + 1847337.

It is an arithmetic number, because the mean of its divisors is an integer number (16625844).

Almost surely, 2^81281882 is an apocalyptic number.

81281882 is a deficient number, since it is larger than the sum of its proper divisors (51724870).

81281882 is a wasteful number, since it uses less digits than its factorization.

81281882 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3694644.

The product of its digits is 16384, while the sum is 38.

The square root of 81281882 is about 9015.6465103730. The cubic root of 81281882 is about 433.1761964113.

The spelling of 81281882 in words is "eighty-one million, two hundred eighty-one thousand, eight hundred eighty-two".