81080004 has 48 divisors (see below), whose sum is σ = 206793216. Its totient is φ = 24614400.

The previous prime is 81079997. The next prime is 81080023. The reversal of 81080004 is 40008018.

It is an unprimeable number.

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 15 ways as a sum of consecutive naturals, for example, 87 + ... + 12734.

It is an arithmetic number, because the mean of its divisors is an integer number (4308192).

Almost surely, 2^81080004 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 81080004, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (103396608).

81080004 is an abundant number, since it is smaller than the sum of its proper divisors (125713212).

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

81080004 is a wasteful number, since it uses less digits than its factorization.

81080004 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12876 (or 12874 counting only the distinct ones).

The product of its (nonzero) digits is 256, while the sum is 21.

The square root of 81080004 is about 9004.4435697049. The cubic root of 81080004 is about 432.8172757422.

The spelling of 81080004 in words is "eighty-one million, eighty thousand, four".