81827454 has 32 divisors (see below), whose sum is σ = 168215040. Its totient is φ = 26525952.

The previous prime is 81827441. The next prime is 81827479. The reversal of 81827454 is 45472818.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 33147 + ... + 35529.

It is an arithmetic number, because the mean of its divisors is an integer number (5256720).

Almost surely, 2^81827454 is an apocalyptic number.

81827454 is an abundant number, since it is smaller than the sum of its proper divisors (86387586).

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

81827454 is a wasteful number, since it uses less digits than its factorization.

81827454 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2544.

The product of its digits is 71680, while the sum is 39.

The square root of 81827454 is about 9045.8528619473. The cubic root of 81827454 is about 434.1432098336.

The spelling of 81827454 in words is "eighty-one million, eight hundred twenty-seven thousand, four hundred fifty-four".