81408147 has 8 divisors (see below), whose sum is σ = 108622080. Its totient is φ = 54233160.

The previous prime is 81408101. The next prime is 81408161. The reversal of 81408147 is 74180418.

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

It is not a de Polignac number, because 81408147 - 2¹¹ = 81406099 is a prime.

It is not an unprimeable number, because it can be changed into a prime (81408167) 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, 4447 + ... + 13512.

It is an arithmetic number, because the mean of its divisors is an integer number (13577760).

Almost surely, 2^81408147 is an apocalyptic number.

81408147 is a deficient number, since it is larger than the sum of its proper divisors (27213933).

81408147 is a wasteful number, since it uses less digits than its factorization.

81408147 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19473.

The product of its (nonzero) digits is 7168, while the sum is 33.

The square root of 81408147 is about 9022.6463412903. The cubic root of 81408147 is about 433.4003820643.

The spelling of 81408147 in words is "eighty-one million, four hundred eight thousand, one hundred forty-seven".