81282375 has 24 divisors (see below), whose sum is σ = 146527056. Its totient is φ = 43350000.

The previous prime is 81282371. The next prime is 81282401. The reversal of 81282375 is 57328218.

81282375 is a `hidden beast` number, since 8 + 1 + 282 + 375 = 666.

It is not a de Polignac number, because 81282375 - 2² = 81282371 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81282371) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 35001 + ... + 37250.

It is an arithmetic number, because the mean of its divisors is an integer number (6105294).

Almost surely, 2^81282375 is an apocalyptic number.

81282375 is a deficient number, since it is larger than the sum of its proper divisors (65244681).

81282375 is a wasteful number, since it uses less digits than its factorization.

81282375 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 72272 (or 72259 counting only the distinct ones).

The product of its digits is 26880, while the sum is 36.

The square root of 81282375 is about 9015.6738516874. The cubic root of 81282375 is about 433.1770721925.

The spelling of 81282375 in words is "eighty-one million, two hundred eighty-two thousand, three hundred seventy-five".