81476256 has 72 divisors (see below), whose sum is σ = 225820224. Its totient is φ = 25718400.

The previous prime is 81476251. The next prime is 81476261. The reversal of 81476256 is 65267418.

It is an interprime number because it is at equal distance from previous prime (81476251) and next prime (81476261).

It is not an unprimeable number, because it can be changed into a prime (81476251) 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 11 ways as a sum of consecutive naturals, for example, 33481 + ... + 35831.

It is an arithmetic number, because the mean of its divisors is an integer number (3136392).

Almost surely, 2^81476256 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 81476256, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (112910112).

81476256 is an abundant number, since it is smaller than the sum of its proper divisors (144343968).

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

81476256 is a wasteful number, since it uses less digits than its factorization.

81476256 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2402 (or 2375 counting only the distinct ones).

The product of its digits is 80640, while the sum is 39.

The square root of 81476256 is about 9026.4198883057. The cubic root of 81476256 is about 433.5212145177.

The spelling of 81476256 in words is "eighty-one million, four hundred seventy-six thousand, two hundred fifty-six".