81478594 has 8 divisors (see below), whose sum is σ = 123151248. Its totient is φ = 40428180.

The previous prime is 81478561. The next prime is 81478597. The reversal of 81478594 is 49587418.

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

It is a super-2 number, since 2×81478594² = 13277522560433672, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (81478597) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 155232 + ... + 155755.

It is an arithmetic number, because the mean of its divisors is an integer number (15393906).

Almost surely, 2^81478594 is an apocalyptic number.

81478594 is a deficient number, since it is larger than the sum of its proper divisors (41672654).

81478594 is a wasteful number, since it uses less digits than its factorization.

81478594 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 311120.

The product of its digits is 322560, while the sum is 46.

The square root of 81478594 is about 9026.5493960871. The cubic root of 81478594 is about 433.5253611773.

The spelling of 81478594 in words is "eighty-one million, four hundred seventy-eight thousand, five hundred ninety-four".