81478488 has 64 divisors (see below), whose sum is σ = 250709760. Its totient is φ = 21488256.

The previous prime is 81478483. The next prime is 81478511. The reversal of 81478488 is 88487418.

It is a happy number.

It is a super-2 number, since 2×81478488² = 13277488013532288, which contains 22 as substring.

It is a nude number because it is divisible by every one of its digits.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81478483) 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, 16470 + ... + 20837.

It is an arithmetic number, because the mean of its divisors is an integer number (3917340).

Almost surely, 2^81478488 is an apocalyptic number.

It is an amenable number.

81478488 is an abundant number, since it is smaller than the sum of its proper divisors (169231272).

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

81478488 is a wasteful number, since it uses less digits than its factorization.

81478488 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 37336 (or 37332 counting only the distinct ones).

The product of its digits is 458752, while the sum is 48.

The square root of 81478488 is about 9026.5435245170. The cubic root of 81478488 is about 433.5251731782.

The spelling of 81478488 in words is "eighty-one million, four hundred seventy-eight thousand, four hundred eighty-eight".