81525248 has 120 divisors (see below), whose sum is σ = 199133088. Its totient is φ = 32643072.

The previous prime is 81525247. The next prime is 81525263. The reversal of 81525248 is 84252518.

It is a happy number.

It is a super-2 number, since 2×81525248² = 13292732122923008, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81525247) 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 11 ways as a sum of consecutive naturals, for example, 1895915 + ... + 1895957.

Almost surely, 2^81525248 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 81525248, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (99566544).

81525248 is an abundant number, since it is smaller than the sum of its proper divisors (117607840).

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

81525248 is an equidigital number, since it uses as much as digits as its factorization.

81525248 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 114 (or 75 counting only the distinct ones).

The product of its digits is 25600, while the sum is 35.

The square root of 81525248 is about 9029.1332917396. The cubic root of 81525248 is about 433.6080897897.

The spelling of 81525248 in words is "eighty-one million, five hundred twenty-five thousand, two hundred forty-eight".