81632655 has 48 divisors (see below), whose sum is σ = 155675520. Its totient is φ = 39320064.

The previous prime is 81632653. The next prime is 81632671. The reversal of 81632655 is 55623618.

It is not a de Polignac number, because 81632655 - 2¹ = 81632653 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81632653) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 26011 + ... + 28979.

It is an arithmetic number, because the mean of its divisors is an integer number (3243240).

Almost surely, 2^81632655 is an apocalyptic number.

81632655 is a deficient number, since it is larger than the sum of its proper divisors (74042865).

81632655 is a wasteful number, since it uses less digits than its factorization.

81632655 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3040 (or 3037 counting only the distinct ones).

The product of its digits is 43200, while the sum is 36.

The square root of 81632655 is about 9035.0791363441. The cubic root of 81632655 is about 433.7984279879.

The spelling of 81632655 in words is "eighty-one million, six hundred thirty-two thousand, six hundred fifty-five".