81478027 has 4 divisors (see below), whose sum is σ = 81502200. Its totient is φ = 81453856.

The previous prime is 81478009. The next prime is 81478031. The reversal of 81478027 is 72087418.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-81478027 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (81478057) 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, 6013 + ... + 14110.

It is an arithmetic number, because the mean of its divisors is an integer number (20375550).

Almost surely, 2^81478027 is an apocalyptic number.

81478027 is a deficient number, since it is larger than the sum of its proper divisors (24173).

81478027 is a wasteful number, since it uses less digits than its factorization.

81478027 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24172.

The product of its (nonzero) digits is 25088, while the sum is 37.

The square root of 81478027 is about 9026.5179886820. The cubic root of 81478027 is about 433.5243555576.

The spelling of 81478027 in words is "eighty-one million, four hundred seventy-eight thousand, twenty-seven".