81827310 has 16 divisors (see below), whose sum is σ = 196385616. Its totient is φ = 21820608.

The previous prime is 81827303. The next prime is 81827327. The reversal of 81827310 is 1372818.

It is a happy number.

It is a super-2 number, since 2×81827310² = 13391417323672200, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (30), and also a Moran number because the ratio is a prime number: 2727577 = 81827310 / (8 + 1 + 8 + 2 + 7 + 3 + 1 + 0).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1363759 + ... + 1363818.

It is an arithmetic number, because the mean of its divisors is an integer number (12274101).

Almost surely, 2^81827310 is an apocalyptic number.

81827310 is an abundant number, since it is smaller than the sum of its proper divisors (114558306).

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

81827310 is a wasteful number, since it uses less digits than its factorization.

81827310 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2727587.

The product of its (nonzero) digits is 2688, while the sum is 30.

The square root of 81827310 is about 9045.8449024953. The cubic root of 81827310 is about 434.1429551650.

The spelling of 81827310 in words is "eighty-one million, eight hundred twenty-seven thousand, three hundred ten".