81773746 has 8 divisors (see below), whose sum is σ = 122780700. Its totient is φ = 40846848.

The previous prime is 81773743. The next prime is 81773759. The reversal of 81773746 is 64737718.

It can be written as a sum of positive squares in 2 ways, for example, as 81703521 + 70225 = 9039^2 + 265^2 .

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

It is not an unprimeable number, because it can be changed into a prime (81773743) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 17391 + ... + 21586.

Almost surely, 2^81773746 is an apocalyptic number.

81773746 is a deficient number, since it is larger than the sum of its proper divisors (41006954).

81773746 is a wasteful number, since it uses less digits than its factorization.

81773746 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 40028.

The product of its digits is 197568, while the sum is 43.

The square root of 81773746 is about 9042.8837214685. The cubic root of 81773746 is about 434.0482047726.

The spelling of 81773746 in words is "eighty-one million, seven hundred seventy-three thousand, seven hundred forty-six".