81478 has 4 divisors (see below), whose sum is σ = 122220. Its totient is φ = 40738.

The previous prime is 81463. The next prime is 81509. The reversal of 81478 is 87418.

It is a semiprime because it is the product of two primes.

It is an alternating number because its digits alternate between even and odd.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20368 + ... + 20371.

It is an arithmetic number, because the mean of its divisors is an integer number (30555).

2⁸¹⁴⁷⁸ is an apocalyptic number.

81478 is a deficient number, since it is larger than the sum of its proper divisors (40742).

81478 is a wasteful number, since it uses less digits than its factorization.

81478 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 40741.

The product of its digits is 1792, while the sum is 28.

The square root of 81478 is about 285.4435145524. The cubic root of 81478 is about 43.3524307671.

The spelling of 81478 in words is "eighty-one thousand, four hundred seventy-eight".