81627855 has 8 divisors (see below), whose sum is σ = 130604592. Its totient is φ = 43534848.

The previous prime is 81627787. The next prime is 81627881. The reversal of 81627855 is 55872618.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 81627855 - 2¹⁴ = 81611471 is a prime.

It is a Smith number, since the sum of its digits (42) 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 an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2720914 + ... + 2720943.

It is an arithmetic number, because the mean of its divisors is an integer number (16325574).

Almost surely, 2^81627855 is an apocalyptic number.

81627855 is a deficient number, since it is larger than the sum of its proper divisors (48976737).

81627855 is a wasteful number, since it uses less digits than its factorization.

81627855 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5441865.

The product of its digits is 134400, while the sum is 42.

The square root of 81627855 is about 9034.8135011189. The cubic root of 81627855 is about 433.7899253723.

The spelling of 81627855 in words is "eighty-one million, six hundred twenty-seven thousand, eight hundred fifty-five".