81342462436 has 27 divisors (see below), whose sum is σ = 144862837609. Its totient is φ = 39965346368.

The previous prime is 81342462419. The next prime is 81342462457. The reversal of 81342462436 is 63426424318.

The square root of 81342462436 is 285206.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in only one way, i.e., 79202844900 + 2139617536 = 281430^2 + 46256^2 .

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 81342462392 and 81342462401.

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 8 ways as a sum of consecutive naturals, for example, 33653100 + ... + 33655516.

Almost surely, 2^81342462436 is an apocalyptic number.

81342462436 is the 285206-th square number.

It is an amenable number.

81342462436 is a deficient number, since it is larger than the sum of its proper divisors (63520375173).

81342462436 is an frugal number, since it uses more digits than its factorization.

81342462436 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4956 (or 2478 counting only the distinct ones).

The product of its digits is 663552, while the sum is 43.

The spelling of 81342462436 in words is "eighty-one billion, three hundred forty-two million, four hundred sixty-two thousand, four hundred thirty-six".