81278894 has 8 divisors (see below), whose sum is σ = 123288480. Its totient is φ = 40182736.

The previous prime is 81278893. The next prime is 81278927. The reversal of 81278894 is 49887218.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81278891) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 228134 + ... + 228489.

It is an arithmetic number, because the mean of its divisors is an integer number (15411060).

Almost surely, 2^81278894 is an apocalyptic number.

81278894 is a deficient number, since it is larger than the sum of its proper divisors (42009586).

81278894 is a wasteful number, since it uses less digits than its factorization.

81278894 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 456714.

The product of its digits is 258048, while the sum is 47.

The square root of 81278894 is about 9015.4807969403. The cubic root of 81278894 is about 433.1708883553.

The spelling of 81278894 in words is "eighty-one million, two hundred seventy-eight thousand, eight hundred ninety-four".