81753600 has 120 divisors (see below), whose sum is σ = 270194760. Its totient is φ = 21790720.

The previous prime is 81753593. The next prime is 81753611. The reversal of 81753600 is 635718.

It is a tau number, because it is divible by the number of its divisors (120).

It is a super-2 number, since 2×81753600² = 13367302225920000, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a congruent number.

It is an unprimeable number.

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, 37336 + ... + 39464.

It is an arithmetic number, because the mean of its divisors is an integer number (2251623).

Almost surely, 2^81753600 is an apocalyptic number.

81753600 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 81753600, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (135097380).

81753600 is an abundant number, since it is smaller than the sum of its proper divisors (188441160).

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

81753600 is a wasteful number, since it uses less digits than its factorization.

81753600 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2160 (or 2139 counting only the distinct ones).

The product of its (nonzero) digits is 5040, while the sum is 30.

The square root of 81753600 is about 9041.7697382758. The cubic root of 81753600 is about 434.0125574173.

The spelling of 81753600 in words is "eighty-one million, seven hundred fifty-three thousand, six hundred".