81763645628 has 12 divisors (see below), whose sum is σ = 163527291312. Its totient is φ = 35041562400.

The previous prime is 81763645603. The next prime is 81763645631. The reversal of 81763645628 is 82654636718.

81763645628 is an admirable number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1460065073 + ... + 1460065128.

It is an arithmetic number, because the mean of its divisors is an integer number (13627274276).

Almost surely, 2^81763645628 is an apocalyptic number.

It is an amenable number.

81763645628 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

81763645628 is a wasteful number, since it uses less digits than its factorization.

81763645628 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2920130212 (or 2920130210 counting only the distinct ones).

The product of its digits is 11612160, while the sum is 56.

The spelling of 81763645628 in words is "eighty-one billion, seven hundred sixty-three million, six hundred forty-five thousand, six hundred twenty-eight".