81260828144 has 40 divisors (see below), whose sum is σ = 159889766400. Its totient is φ = 40003616448.

The previous prime is 81260828119. The next prime is 81260828191. The reversal of 81260828144 is 44182806218.

It is a junction number, because it is equal to n+sod(n) for n = 81260828095 and 81260828104.

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, 133457 + ... + 424655.

It is an arithmetic number, because the mean of its divisors is an integer number (3997244160).

Almost surely, 2^81260828144 is an apocalyptic number.

It is an amenable number.

81260828144 is a deficient number, since it is larger than the sum of its proper divisors (78628938256).

81260828144 is a wasteful number, since it uses less digits than its factorization.

81260828144 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 291477 (or 291471 counting only the distinct ones).

The product of its (nonzero) digits is 196608, while the sum is 44.

The spelling of 81260828144 in words is "eighty-one billion, two hundred sixty million, eight hundred twenty-eight thousand, one hundred forty-four".