81850610 has 8 divisors (see below), whose sum is σ = 147331116. Its totient is φ = 32740240.

The previous prime is 81850609. The next prime is 81850619. The reversal of 81850610 is 1605818.

It can be written as a sum of positive squares in 2 ways, for example, as 81848209 + 2401 = 9047^2 + 49^2 .

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 (81850619) 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 3 ways as a sum of consecutive naturals, for example, 4092521 + ... + 4092540.

Almost surely, 2^81850610 is an apocalyptic number.

81850610 is a deficient number, since it is larger than the sum of its proper divisors (65480506).

81850610 is a wasteful number, since it uses less digits than its factorization.

81850610 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8185068.

The product of its (nonzero) digits is 1920, while the sum is 29.

The square root of 81850610 is about 9047.1326949482. The cubic root of 81850610 is about 434.1841580791.

The spelling of 81850610 in words is "eighty-one million, eight hundred fifty thousand, six hundred ten".