81276417 has 12 divisors (see below), whose sum is σ = 118562964. Its totient is φ = 53647200.

The previous prime is 81276413. The next prime is 81276443. The reversal of 81276417 is 71467218.

81276417 is a `hidden beast` number, since 8 + 1 + 2 + 7 + 641 + 7 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 61214976 + 20061441 = 7824^2 + 4479^2 .

It is not a de Polignac number, because 81276417 - 2² = 81276413 is a prime.

It is not an unprimeable number, because it can be changed into a prime (81276413) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 43798 + ... + 45615.

It is an arithmetic number, because the mean of its divisors is an integer number (9880247).

Almost surely, 2^81276417 is an apocalyptic number.

It is an amenable number.

81276417 is a deficient number, since it is larger than the sum of its proper divisors (37286547).

81276417 is a wasteful number, since it uses less digits than its factorization.

81276417 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 89520 (or 89517 counting only the distinct ones).

The product of its digits is 18816, while the sum is 36.

The square root of 81276417 is about 9015.3434210794. The cubic root of 81276417 is about 433.1664879706.

The spelling of 81276417 in words is "eighty-one million, two hundred seventy-six thousand, four hundred seventeen".