81480555928 has 32 divisors (see below), whose sum is σ = 160919208000. Its totient is φ = 38571495840.

The previous prime is 81480555901. The next prime is 81480555931. The reversal of 81480555928 is 82955508418.

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, 70263 + ... + 409753.

It is an arithmetic number, because the mean of its divisors is an integer number (5028725250).

Almost surely, 2^81480555928 is an apocalyptic number.

It is an amenable number.

81480555928 is a deficient number, since it is larger than the sum of its proper divisors (79438652072).

81480555928 is a wasteful number, since it uses less digits than its factorization.

81480555928 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 341095 (or 341091 counting only the distinct ones).

The product of its (nonzero) digits is 4608000, while the sum is 55.

The spelling of 81480555928 in words is "eighty-one billion, four hundred eighty million, five hundred fifty-five thousand, nine hundred twenty-eight".