81073400 has 48 divisors (see below), whose sum is σ = 193112640. Its totient is φ = 31635200.

The previous prime is 81073397. The next prime is 81073403. The reversal of 81073400 is 437018.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (81073397) and next prime (81073403).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81073403) 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 11 ways as a sum of consecutive naturals, for example, 3257 + ... + 13143.

It is an arithmetic number, because the mean of its divisors is an integer number (4023180).

Almost surely, 2^81073400 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 81073400, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (96556320).

81073400 is an abundant number, since it is smaller than the sum of its proper divisors (112039240).

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

81073400 is a wasteful number, since it uses less digits than its factorization.

81073400 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9944 (or 9935 counting only the distinct ones).

The product of its (nonzero) digits is 672, while the sum is 23.

The square root of 81073400 is about 9004.0768544032. The cubic root of 81073400 is about 432.8055243742.

The spelling of 81073400 in words is "eighty-one million, seventy-three thousand, four hundred".