81782110 has 16 divisors (see below), whose sum is σ = 147311856. Its totient is φ = 32689728.

The previous prime is 81782093. The next prime is 81782111. The reversal of 81782110 is 1128718.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81782111) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 23077 + ... + 26383.

It is an arithmetic number, because the mean of its divisors is an integer number (9206991).

Almost surely, 2^81782110 is an apocalyptic number.

81782110 is a deficient number, since it is larger than the sum of its proper divisors (65529746).

81782110 is a wasteful number, since it uses less digits than its factorization.

81782110 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5787.

The product of its (nonzero) digits is 896, while the sum is 28.

The square root of 81782110 is about 9043.3461727394. The cubic root of 81782110 is about 434.0630027389.

The spelling of 81782110 in words is "eighty-one million, seven hundred eighty-two thousand, one hundred ten".