81478146 has 16 divisors (see below), whose sum is σ = 164480544. Its totient is φ = 26905344.

The previous prime is 81478141. The next prime is 81478153. The reversal of 81478146 is 64187418.

It is not an unprimeable number, because it can be changed into a prime (81478141) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 62815 + ... + 64098.

It is an arithmetic number, because the mean of its divisors is an integer number (10280034).

Almost surely, 2^81478146 is an apocalyptic number.

81478146 is an abundant number, since it is smaller than the sum of its proper divisors (83002398).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

81478146 is a wasteful number, since it uses less digits than its factorization.

81478146 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 127025.

The product of its digits is 43008, while the sum is 39.

The square root of 81478146 is about 9026.5245803687. The cubic root of 81478146 is about 433.5245666140.

The spelling of 81478146 in words is "eighty-one million, four hundred seventy-eight thousand, one hundred forty-six".