81474384 has 20 divisors (see below), whose sum is σ = 210475616. Its totient is φ = 27158112.

The previous prime is 81474373. The next prime is 81474391. The reversal of 81474384 is 48347418.

It is a congruent number.

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 3 ways as a sum of consecutive naturals, for example, 848644 + ... + 848739.

Almost surely, 2^81474384 is an apocalyptic number.

It is an amenable number.

81474384 is an abundant number, since it is smaller than the sum of its proper divisors (129001232).

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

81474384 is a wasteful number, since it uses less digits than its factorization.

81474384 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1697394 (or 1697388 counting only the distinct ones).

The product of its digits is 86016, while the sum is 39.

The square root of 81474384 is about 9026.3161921129. The cubic root of 81474384 is about 433.5178942951.

The spelling of 81474384 in words is "eighty-one million, four hundred seventy-four thousand, three hundred eighty-four".