81478419 has 16 divisors (see below), whose sum is σ = 118692864. Its totient is φ = 49306400.

The previous prime is 81478409. The next prime is 81478451. The reversal of 81478419 is 91487418.

It is not a de Polignac number, because 81478419 - 2¹⁷ = 81347347 is a prime.

It is a super-2 number, since 2×81478419² = 13277465525479122, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (81478409) 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 15 ways as a sum of consecutive naturals, for example, 27049 + ... + 29909.

It is an arithmetic number, because the mean of its divisors is an integer number (7418304).

Almost surely, 2^81478419 is an apocalyptic number.

81478419 is a deficient number, since it is larger than the sum of its proper divisors (37214445).

81478419 is a wasteful number, since it uses less digits than its factorization.

81478419 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3738.

The product of its digits is 64512, while the sum is 42.

The square root of 81478419 is about 9026.5397024552. The cubic root of 81478419 is about 433.5250508014.

The spelling of 81478419 in words is "eighty-one million, four hundred seventy-eight thousand, four hundred nineteen".