81204456 has 16 divisors (see below), whose sum is σ = 203011200. Its totient is φ = 27068144.

The previous prime is 81204451. The next prime is 81204457. The reversal of 81204456 is 65440218.

It is not an unprimeable number, because it can be changed into a prime (81204451) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1691736 + ... + 1691783.

It is an arithmetic number, because the mean of its divisors is an integer number (12688200).

Almost surely, 2^81204456 is an apocalyptic number.

It is an amenable number.

81204456 is an abundant number, since it is smaller than the sum of its proper divisors (121806744).

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

81204456 is a wasteful number, since it uses less digits than its factorization.

81204456 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3383528 (or 3383524 counting only the distinct ones).

The product of its (nonzero) digits is 7680, while the sum is 30.

The square root of 81204456 is about 9011.3515079593. The cubic root of 81204456 is about 433.0386103779.

The spelling of 81204456 in words is "eighty-one million, two hundred four thousand, four hundred fifty-six".