81463275 has 18 divisors (see below), whose sum is σ = 145910180. Its totient is φ = 43446960.

The previous prime is 81463271. The next prime is 81463297. The reversal of 81463275 is 57236418.

81463275 is a `hidden beast` number, since 8 + 14 + 632 + 7 + 5 = 666.

It is not a de Polignac number, because 81463275 - 2² = 81463271 is a prime.

It is not an unprimeable number, because it can be changed into a prime (81463271) by changing a digit.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 180805 + ... + 181254.

Almost surely, 2^81463275 is an apocalyptic number.

81463275 is a deficient number, since it is larger than the sum of its proper divisors (64446905).

81463275 is a wasteful number, since it uses less digits than its factorization.

81463275 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 362075 (or 362067 counting only the distinct ones).

The product of its digits is 40320, while the sum is 36.

The square root of 81463275 is about 9025.7008038157. The cubic root of 81463275 is about 433.4981900684.

The spelling of 81463275 in words is "eighty-one million, four hundred sixty-three thousand, two hundred seventy-five".