81478090 has 16 divisors (see below), whose sum is σ = 147634560. Its totient is φ = 32374800.

The previous prime is 81478087. The next prime is 81478129. The reversal of 81478090 is 9087418.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 25470 + ... + 28489.

It is an arithmetic number, because the mean of its divisors is an integer number (9227160).

Almost surely, 2^81478090 is an apocalyptic number.

81478090 is a deficient number, since it is larger than the sum of its proper divisors (66156470).

81478090 is a wasteful number, since it uses less digits than its factorization.

81478090 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 54117.

The product of its (nonzero) digits is 16128, while the sum is 37.

The square root of 81478090 is about 9026.5214783991. The cubic root of 81478090 is about 433.5244672933.

The spelling of 81478090 in words is "eighty-one million, four hundred seventy-eight thousand, ninety".