81275504 has 40 divisors (see below), whose sum is σ = 170636400. Its totient is φ = 37352448.

The previous prime is 81275503. The next prime is 81275507. The reversal of 81275504 is 40557218.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81275501) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 8222 + ... + 15170.

It is an arithmetic number, because the mean of its divisors is an integer number (4265910).

Almost surely, 2^81275504 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 81275504, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (85318200).

81275504 is an abundant number, since it is smaller than the sum of its proper divisors (89360896).

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

81275504 is a wasteful number, since it uses less digits than its factorization.

81275504 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7017 (or 7011 counting only the distinct ones).

The product of its (nonzero) digits is 11200, while the sum is 32.

The square root of 81275504 is about 9015.2927850403. The cubic root of 81275504 is about 433.1648660058.

It can be divided in two parts, 8127 and 5504, that added together give a palindrome (13631).

The spelling of 81275504 in words is "eighty-one million, two hundred seventy-five thousand, five hundred four".