81752850 has 72 divisors (see below), whose sum is σ = 221392080. Its totient is φ = 21627360.

The previous prime is 81752849. The next prime is 81752863. The reversal of 81752850 is 5825718.

81752850 is a `hidden beast` number, since 81 + 7 + 528 + 50 = 666.

It is an unprimeable number.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 61897 + ... + 63203.

It is an arithmetic number, because the mean of its divisors is an integer number (3074890).

Almost surely, 2^81752850 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 81752850, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (110696040).

81752850 is an abundant number, since it is smaller than the sum of its proper divisors (139639230).

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

81752850 is a wasteful number, since it uses less digits than its factorization.

81752850 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1464 (or 1456 counting only the distinct ones).

The product of its (nonzero) digits is 22400, while the sum is 36.

The square root of 81752850 is about 9041.7282639991. The cubic root of 81752850 is about 434.0112302162.

It can be divided in two parts, 8175 and 2850, that added together give a square (11025 = 105²).

The spelling of 81752850 in words is "eighty-one million, seven hundred fifty-two thousand, eight hundred fifty".