81413774 has 8 divisors (see below), whose sum is σ = 131514600. Its totient is φ = 37575576.

The previous prime is 81413747. The next prime is 81413789. The reversal of 81413774 is 47731418.

It is a sphenic number, since it is the product of 3 distinct primes.

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, 1565624 + ... + 1565675.

It is an arithmetic number, because the mean of its divisors is an integer number (16439325).

Almost surely, 2^81413774 is an apocalyptic number.

81413774 is a deficient number, since it is larger than the sum of its proper divisors (50100826).

81413774 is a wasteful number, since it uses less digits than its factorization.

81413774 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3131314.

The product of its digits is 18816, while the sum is 35.

The square root of 81413774 is about 9022.9581623767. The cubic root of 81413774 is about 433.4103675013.

The spelling of 81413774 in words is "eighty-one million, four hundred thirteen thousand, seven hundred seventy-four".