81461400328 has 32 divisors (see below), whose sum is σ = 190429248960. Its totient is φ = 31738207680.

The previous prime is 81461400313. The next prime is 81461400329. The reversal of 81461400328 is 82300416418.

It is not an unprimeable number, because it can be changed into a prime (81461400329) by changing a digit.

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, 66120651 + ... + 66121882.

It is an arithmetic number, because the mean of its divisors is an integer number (5950914030).

Almost surely, 2^81461400328 is an apocalyptic number.

81461400328 is a gapful number since it is divisible by the number (88) formed by its first and last digit.

It is an amenable number.

81461400328 is an abundant number, since it is smaller than the sum of its proper divisors (108967848632).

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

81461400328 is a wasteful number, since it uses less digits than its factorization.

81461400328 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 132242557 (or 132242553 counting only the distinct ones).

The product of its (nonzero) digits is 36864, while the sum is 37.

The spelling of 81461400328 in words is "eighty-one billion, four hundred sixty-one million, four hundred thousand, three hundred twenty-eight".