81096400 has 120 divisors (see below), whose sum is σ = 243002304. Its totient is φ = 25267200.

The previous prime is 81096397. The next prime is 81096419. The reversal of 81096400 is 469018.

It is a Harshad number since it is a multiple of its sum of digits (28).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 29484 + ... + 32116.

Almost surely, 2^81096400 is an apocalyptic number.

81096400 is a gapful number since it is divisible by the number (80) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 81096400, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (121501152).

81096400 is an abundant number, since it is smaller than the sum of its proper divisors (161905904).

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

81096400 is a wasteful number, since it uses less digits than its factorization.

81096400 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2669 (or 2658 counting only the distinct ones).

The product of its (nonzero) digits is 1728, while the sum is 28.

The square root of 81096400 is about 9005.3539630600. The cubic root of 81096400 is about 432.8464485485.

The spelling of 81096400 in words is "eighty-one million, ninety-six thousand, four hundred".