81201706 has 16 divisors (see below), whose sum is σ = 130023360. Its totient is φ = 37920960.

The previous prime is 81201697. The next prime is 81201709. The reversal of 81201706 is 60710218.

It is not an unprimeable number, because it can be changed into a prime (81201709) 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, 12351 + ... + 17746.

It is an arithmetic number, because the mean of its divisors is an integer number (8126460).

Almost surely, 2^81201706 is an apocalyptic number.

81201706 is a deficient number, since it is larger than the sum of its proper divisors (48821654).

81201706 is a wasteful number, since it uses less digits than its factorization.

81201706 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30189.

The product of its (nonzero) digits is 672, while the sum is 25.

The square root of 81201706 is about 9011.1989213423. The cubic root of 81201706 is about 433.0337220188.

The spelling of 81201706 in words is "eighty-one million, two hundred one thousand, seven hundred six".