81166830 has 16 divisors (see below), whose sum is σ = 194800464. Its totient is φ = 21644480.

The previous prime is 81166819. The next prime is 81166837. The reversal of 81166830 is 3866118.

It is a junction number, because it is equal to n+sod(n) for n = 81166791 and 81166800.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81166837) 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, 1352751 + ... + 1352810.

It is an arithmetic number, because the mean of its divisors is an integer number (12175029).

Almost surely, 2^81166830 is an apocalyptic number.

81166830 is an abundant number, since it is smaller than the sum of its proper divisors (113633634).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

81166830 is a wasteful number, since it uses less digits than its factorization.

81166830 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2705571.

The product of its (nonzero) digits is 6912, while the sum is 33.

The square root of 81166830 is about 9009.2635659081. The cubic root of 81166830 is about 432.9717173824.

The spelling of 81166830 in words is "eighty-one million, one hundred sixty-six thousand, eight hundred thirty".