81208727582 has 16 divisors (see below), whose sum is σ = 122951228400. Its totient is φ = 40225109760.

The previous prime is 81208727491. The next prime is 81208727627. The reversal of 81208727582 is 28572780218.

It is a self number, because there is not a number n which added to its sum of digits gives 81208727582.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1430357 + ... + 1486047.

It is an arithmetic number, because the mean of its divisors is an integer number (7684451775).

Almost surely, 2^81208727582 is an apocalyptic number.

81208727582 is a deficient number, since it is larger than the sum of its proper divisors (41742500818).

81208727582 is a wasteful number, since it uses less digits than its factorization.

81208727582 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 62491.

The product of its (nonzero) digits is 1003520, while the sum is 50.

The spelling of 81208727582 in words is "eighty-one billion, two hundred eight million, seven hundred twenty-seven thousand, five hundred eighty-two".