81046040 has 16 divisors (see below), whose sum is σ = 182353680. Its totient is φ = 32418400.

The previous prime is 81045989. The next prime is 81046051. The reversal of 81046040 is 4064018.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 81045997 and 81046015.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1013036 + ... + 1013115.

It is an arithmetic number, because the mean of its divisors is an integer number (11397105).

Almost surely, 2^81046040 is an apocalyptic number.

It is an amenable number.

81046040 is an abundant number, since it is smaller than the sum of its proper divisors (101307640).

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

81046040 is a wasteful number, since it uses less digits than its factorization.

81046040 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2026162 (or 2026158 counting only the distinct ones).

The product of its (nonzero) digits is 768, while the sum is 23.

The square root of 81046040 is about 9002.5574144240. The cubic root of 81046040 is about 432.7568323188.

The spelling of 81046040 in words is "eighty-one million, forty-six thousand, forty".