81474416 has 20 divisors (see below), whose sum is σ = 158094792. Its totient is φ = 40675776.

The previous prime is 81474391. The next prime is 81474461. The reversal of 81474416 is 61447418.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8255 + ... + 15201.

Almost surely, 2^81474416 is an apocalyptic number.

It is an amenable number.

81474416 is a deficient number, since it is larger than the sum of its proper divisors (76620376).

81474416 is a wasteful number, since it uses less digits than its factorization.

81474416 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7688 (or 7682 counting only the distinct ones).

The product of its digits is 21504, while the sum is 35.

The square root of 81474416 is about 9026.3179647074. The cubic root of 81474416 is about 433.5179510514.

The spelling of 81474416 in words is "eighty-one million, four hundred seventy-four thousand, four hundred sixteen".