81058728669 has 8 divisors (see below), whose sum is σ = 111564701952. Its totient is φ = 52295953920.

The previous prime is 81058728661. The next prime is 81058728671. The reversal of 81058728669 is 96682785018.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 81058728669 - 2³ = 81058728661 is a prime.

It is a super-2 number, since 2×81058728669² (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 (81058728661) 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, 435799524 + ... + 435799709.

It is an arithmetic number, because the mean of its divisors is an integer number (13945587744).

Almost surely, 2^81058728669 is an apocalyptic number.

It is an amenable number.

81058728669 is a deficient number, since it is larger than the sum of its proper divisors (30505973283).

81058728669 is a wasteful number, since it uses less digits than its factorization.

81058728669 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 871599267.

The product of its (nonzero) digits is 11612160, while the sum is 60.

The spelling of 81058728669 in words is "eighty-one billion, fifty-eight million, seven hundred twenty-eight thousand, six hundred sixty-nine".