81242477428 has 12 divisors (see below), whose sum is σ = 162484954912. Its totient is φ = 34818204600.

The previous prime is 81242477411. The next prime is 81242477443. The reversal of 81242477428 is 82477424218.

81242477428 is an admirable number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1450758498 + ... + 1450758553.

Almost surely, 2^81242477428 is an apocalyptic number.

It is an amenable number.

81242477428 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.

81242477428 is a wasteful number, since it uses less digits than its factorization.

81242477428 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2901517062 (or 2901517060 counting only the distinct ones).

The product of its digits is 1605632, while the sum is 49.

The spelling of 81242477428 in words is "eighty-one billion, two hundred forty-two million, four hundred seventy-seven thousand, four hundred twenty-eight".