81327770 has 32 divisors (see below), whose sum is σ = 154282752. Its totient is φ = 30805632.

The previous prime is 81327761. The next prime is 81327781. The reversal of 81327770 is 7772318.

It is a super-2 number, since 2×81327770² = 13228412346345800, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 81327770.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 21974 + ... + 25406.

It is an arithmetic number, because the mean of its divisors is an integer number (4821336).

Almost surely, 2^81327770 is an apocalyptic number.

81327770 is a deficient number, since it is larger than the sum of its proper divisors (72954982).

81327770 is a wasteful number, since it uses less digits than its factorization.

81327770 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3566.

The product of its (nonzero) digits is 16464, while the sum is 35.

The square root of 81327770 is about 9018.1910602959. The cubic root of 81327770 is about 433.2576981733.

The spelling of 81327770 in words is "eighty-one million, three hundred twenty-seven thousand, seven hundred seventy".