81275804 has 24 divisors (see below), whose sum is σ = 145345200. Its totient is φ = 39755520.

The previous prime is 81275801. The next prime is 81275819. The reversal of 81275804 is 40857218.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81275801) 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 7 ways as a sum of consecutive naturals, for example, 56162 + ... + 57590.

It is an arithmetic number, because the mean of its divisors is an integer number (6056050).

Almost surely, 2^81275804 is an apocalyptic number.

It is an amenable number.

81275804 is a deficient number, since it is larger than the sum of its proper divisors (64069396).

81275804 is a wasteful number, since it uses less digits than its factorization.

81275804 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1733 (or 1731 counting only the distinct ones).

The product of its (nonzero) digits is 17920, while the sum is 35.

The square root of 81275804 is about 9015.3094234197. The cubic root of 81275804 is about 433.1653989638.

It can be divided in two parts, 8127 and 5804, that added together give a palindrome (13931).

The spelling of 81275804 in words is "eighty-one million, two hundred seventy-five thousand, eight hundred four".