81497600 has 60 divisors (see below), whose sum is σ = 201948384. Its totient is φ = 32593920.

The previous prime is 81497597. The next prime is 81497621. The reversal of 81497600 is 679418.

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 5 ways as a sum of consecutive naturals, for example, 9617 + ... + 15983.

Almost surely, 2^81497600 is an apocalyptic number.

81497600 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 81497600, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (100974192).

81497600 is an abundant number, since it is smaller than the sum of its proper divisors (120450784).

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

81497600 is an equidigital number, since it uses as much as digits as its factorization.

81497600 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6395 (or 6374 counting only the distinct ones).

The product of its (nonzero) digits is 12096, while the sum is 35.

The square root of 81497600 is about 9027.6021179492. The cubic root of 81497600 is about 433.5590671363.

The spelling of 81497600 in words is "eighty-one million, four hundred ninety-seven thousand, six hundred".