81883066 has 8 divisors (see below), whose sum is σ = 127060020. Its totient is φ = 39529728.

The previous prime is 81883063. The next prime is 81883079. The reversal of 81883066 is 66038818.

It can be written as a sum of positive squares in 2 ways, for example, as 80478841 + 1404225 = 8971^2 + 1185^2 .

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

It is not an unprimeable number, because it can be changed into a prime (81883063) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 705831 + ... + 705946.

Almost surely, 2^81883066 is an apocalyptic number.

81883066 is a deficient number, since it is larger than the sum of its proper divisors (45176954).

81883066 is a wasteful number, since it uses less digits than its factorization.

81883066 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1411808.

The product of its (nonzero) digits is 55296, while the sum is 40.

The square root of 81883066 is about 9048.9262346424. The cubic root of 81883066 is about 434.2415391170.

The spelling of 81883066 in words is "eighty-one million, eight hundred eighty-three thousand, sixty-six".