82721250 has 200 divisors, whose sum is σ = 249482640. Its totient is φ = 20412000.

The previous prime is 82721227. The next prime is 82721281. The reversal of 82721250 is 5212728.

It is a hoax number, since the sum of its digits (27) coincides with the sum of the digits of its distinct prime factors.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is an unprimeable number.

It is a polite number, since it can be written in 99 ways as a sum of consecutive naturals, for example, 1923729 + ... + 1923771.

Almost surely, 2^82721250 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 82721250, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (124741320).

82721250 is an abundant number, since it is smaller than the sum of its proper divisors (166761390).

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

82721250 is a wasteful number, since it uses less digits than its factorization.

82721250 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 96 (or 72 counting only the distinct ones).

The product of its (nonzero) digits is 2240, while the sum is 27.

The square root of 82721250 is about 9095.1223191335. The cubic root of 82721250 is about 435.7181952785.

Adding to 82721250 its reverse (5212728), we get a palindrome (87933978).

The spelling of 82721250 in words is "eighty-two million, seven hundred twenty-one thousand, two hundred fifty".