81275406 has 16 divisors (see below), whose sum is σ = 162649344. Its totient is φ = 27075384.

The previous prime is 81275377. The next prime is 81275431. The reversal of 81275406 is 60457218.

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 7 ways as a sum of consecutive naturals, for example, 10761 + ... + 16683.

It is an arithmetic number, because the mean of its divisors is an integer number (10165584).

Almost surely, 2^81275406 is an apocalyptic number.

81275406 is an abundant number, since it is smaller than the sum of its proper divisors (81373938).

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

81275406 is a wasteful number, since it uses less digits than its factorization.

81275406 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8215.

The product of its (nonzero) digits is 13440, while the sum is 33.

The square root of 81275406 is about 9015.2873498297. The cubic root of 81275406 is about 433.1646919058.

The spelling of 81275406 in words is "eighty-one million, two hundred seventy-five thousand, four hundred six".