81280925328 has 40 divisors (see below), whose sum is σ = 210248869600. Its totient is φ = 27058397184.

The previous prime is 81280925281. The next prime is 81280925389. The reversal of 81280925328 is 82352908218.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (48).

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 7 ways as a sum of consecutive naturals, for example, 1064098 + ... + 1137921.

It is an arithmetic number, because the mean of its divisors is an integer number (5256221740).

Almost surely, 2^81280925328 is an apocalyptic number.

It is an amenable number.

81280925328 is an abundant number, since it is smaller than the sum of its proper divisors (128967944272).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

81280925328 is a wasteful number, since it uses less digits than its factorization.

81280925328 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2202799 (or 2202793 counting only the distinct ones).

The product of its (nonzero) digits is 552960, while the sum is 48.

The spelling of 81280925328 in words is "eighty-one billion, two hundred eighty million, nine hundred twenty-five thousand, three hundred twenty-eight".