81387827 has 8 divisors (see below), whose sum is σ = 83721600. Its totient is φ = 79061184.

The previous prime is 81387821. The next prime is 81387851. The reversal of 81387827 is 72878318.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 81387827 - 2⁸ = 81387571 is a prime.

It is a super-3 number, since 3×81387827³ (a number of 25 digits) contains 333 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (81387821) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 28574 + ... + 31292.

It is an arithmetic number, because the mean of its divisors is an integer number (10465200).

Almost surely, 2^81387827 is an apocalyptic number.

81387827 is a deficient number, since it is larger than the sum of its proper divisors (2333773).

81387827 is a wasteful number, since it uses less digits than its factorization.

81387827 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3565.

The product of its digits is 150528, while the sum is 44.

The square root of 81387827 is about 9021.5202155734. The cubic root of 81387827 is about 433.3643192175.

The spelling of 81387827 in words is "eighty-one million, three hundred eighty-seven thousand, eight hundred twenty-seven".