81044000 has 48 divisors (see below), whose sum is σ = 199134936. Its totient is φ = 32416000.

The previous prime is 81043979. The next prime is 81044021. The reversal of 81044000 is 44018.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (81043979) and next prime (81044021).

It can be written as a sum of positive squares in 4 ways, for example, as 4376464 + 76667536 = 2092^2 + 8756^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 81044000.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6131 + ... + 14130.

Almost surely, 2^81044000 is an apocalyptic number.

81044000 is a gapful number since it is divisible by the number (80) formed by its first and last digit.

It is an amenable number.

81044000 is an abundant number, since it is smaller than the sum of its proper divisors (118090936).

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

81044000 is a wasteful number, since it uses less digits than its factorization.

81044000 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20286 (or 20268 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 17.

The square root of 81044000 is about 9002.4441125730. Note that the first 3 decimals coincide. The cubic root of 81044000 is about 432.7532013318.

Adding to 81044000 its reverse (44018), we get a palindrome (81088018).

The spelling of 81044000 in words is "eighty-one million, forty-four thousand".