81647622232 has 32 divisors (see below), whose sum is σ = 167200174080. Its totient is φ = 37069516960.

The previous prime is 81647622227. The next prime is 81647622233. The reversal of 81647622232 is 23222674618.

It is a super-2 number, since 2×81647622232² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81647622233) 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, 461608 + ... + 613495.

It is an arithmetic number, because the mean of its divisors is an integer number (5225005440).

Almost surely, 2^81647622232 is an apocalyptic number.

It is an amenable number.

81647622232 is an abundant number, since it is smaller than the sum of its proper divisors (85552551848).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

81647622232 is a wasteful number, since it uses less digits than its factorization.

81647622232 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1075983 (or 1075979 counting only the distinct ones).

The product of its digits is 387072, while the sum is 43.

The spelling of 81647622232 in words is "eighty-one billion, six hundred forty-seven million, six hundred twenty-two thousand, two hundred thirty-two".