81627686 has 16 divisors (see below), whose sum is σ = 147298560. Its totient is φ = 33141960.

The previous prime is 81627683. The next prime is 81627691. The reversal of 81627686 is 68672618.

It is a Smith number, since the sum of its digits (44) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81627683) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 153170 + ... + 153701.

It is an arithmetic number, because the mean of its divisors is an integer number (9206160).

Almost surely, 2^81627686 is an apocalyptic number.

81627686 is a deficient number, since it is larger than the sum of its proper divisors (65670874).

81627686 is a wasteful number, since it uses less digits than its factorization.

81627686 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 306899.

The product of its digits is 193536, while the sum is 44.

The square root of 81627686 is about 9034.8041484030. The cubic root of 81627686 is about 433.7896260033.

The spelling of 81627686 in words is "eighty-one million, six hundred twenty-seven thousand, six hundred eighty-six".