81250650 has 288 divisors, whose sum is σ = 268107840. Its totient is φ = 17418240.

The previous prime is 81250627. The next prime is 81250657. The reversal of 81250650 is 5605218.

81250650 is a `hidden beast` number, since 8 + 1 + 2 + 5 + 0 + 650 = 666.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81250657) by changing a digit.

It is a polite number, since it can be written in 143 ways as a sum of consecutive naturals, for example, 1889529 + ... + 1889571.

It is an arithmetic number, because the mean of its divisors is an integer number (930930).

Almost surely, 2^81250650 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 81250650, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (134053920).

81250650 is an abundant number, since it is smaller than the sum of its proper divisors (186857190).

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

81250650 is a wasteful number, since it uses less digits than its factorization.

81250650 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 110 (or 102 counting only the distinct ones).

The product of its (nonzero) digits is 2400, while the sum is 27.

The square root of 81250650 is about 9013.9142441006. The cubic root of 81250650 is about 433.1207076528.

Adding to 81250650 its reverse (5605218), we get a palindrome (86855868).

The spelling of 81250650 in words is "eighty-one million, two hundred fifty thousand, six hundred fifty".