81276655 has 8 divisors (see below), whose sum is σ = 97647984. Its totient is φ = 64944000.

The previous prime is 81276653. The next prime is 81276659. The reversal of 81276655 is 55667218.

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

It is not a de Polignac number, because 81276655 - 2¹ = 81276653 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81276653) 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, 4821 + ... + 13630.

It is an arithmetic number, because the mean of its divisors is an integer number (12205998).

Almost surely, 2^81276655 is an apocalyptic number.

81276655 is a deficient number, since it is larger than the sum of its proper divisors (16371329).

81276655 is a wasteful number, since it uses less digits than its factorization.

81276655 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19337.

The product of its digits is 100800, while the sum is 40.

The square root of 81276655 is about 9015.3566207888. The cubic root of 81276655 is about 433.1669107810.

The spelling of 81276655 in words is "eighty-one million, two hundred seventy-six thousand, six hundred fifty-five".