81827415 has 40 divisors (see below), whose sum is σ = 151763040. Its totient is φ = 42130368.

The previous prime is 81827393. The next prime is 81827441. The reversal of 81827415 is 51472818.

It is not a de Polignac number, because 81827415 - 2⁶ = 81827351 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 81827415.

It is a congruent number.

It is an unprimeable number.

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 39 ways as a sum of consecutive naturals, for example, 8262 + ... + 15228.

It is an arithmetic number, because the mean of its divisors is an integer number (3794076).

Almost surely, 2^81827415 is an apocalyptic number.

81827415 is a deficient number, since it is larger than the sum of its proper divisors (69935625).

81827415 is a wasteful number, since it uses less digits than its factorization.

81827415 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7013 (or 7004 counting only the distinct ones).

The product of its digits is 17920, while the sum is 36.

The square root of 81827415 is about 9045.8507062631. The cubic root of 81827415 is about 434.1431408609.

The spelling of 81827415 in words is "eighty-one million, eight hundred twenty-seven thousand, four hundred fifteen".