81373250 has 32 divisors (see below), whose sum is σ = 174096000. Its totient is φ = 27898800.

The previous prime is 81373247. The next prime is 81373261. The reversal of 81373250 is 5237318.

It is a Curzon number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 21500 + ... + 24999.

It is an arithmetic number, because the mean of its divisors is an integer number (5440500).

Almost surely, 2^81373250 is an apocalyptic number.

81373250 is an abundant number, since it is smaller than the sum of its proper divisors (92722750).

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

81373250 is a wasteful number, since it uses less digits than its factorization.

81373250 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 46523 (or 46513 counting only the distinct ones).

The product of its (nonzero) digits is 5040, while the sum is 29.

The square root of 81373250 is about 9020.7122778636. The cubic root of 81373250 is about 433.3384450416.

The spelling of 81373250 in words is "eighty-one million, three hundred seventy-three thousand, two hundred fifty".