81448379 has 8 divisors (see below), whose sum is σ = 82969920. Its totient is φ = 79931656.

The previous prime is 81448369. The next prime is 81448387. The reversal of 81448379 is 97384418.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-81448379 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (81448369) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 68024 + ... + 69210.

It is an arithmetic number, because the mean of its divisors is an integer number (10371240).

Almost surely, 2^81448379 is an apocalyptic number.

81448379 is a deficient number, since it is larger than the sum of its proper divisors (1521541).

81448379 is a wasteful number, since it uses less digits than its factorization.

81448379 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2409.

The product of its digits is 193536, while the sum is 44.

The square root of 81448379 is about 9024.8755670092. The cubic root of 81448379 is about 433.4717659623.

The spelling of 81448379 in words is "eighty-one million, four hundred forty-eight thousand, three hundred seventy-nine".