81248370 has 96 divisors (see below), whose sum is σ = 238852800. Its totient is φ = 17587584.

The previous prime is 81248329. The next prime is 81248381. The reversal of 81248370 is 7384218.

It is an unprimeable number.

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 47 ways as a sum of consecutive naturals, for example, 26476 + ... + 29384.

It is an arithmetic number, because the mean of its divisors is an integer number (2488050).

Almost surely, 2^81248370 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 81248370, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (119426400).

81248370 is an abundant number, since it is smaller than the sum of its proper divisors (157604430).

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

81248370 is a wasteful number, since it uses less digits than its factorization.

81248370 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2952 (or 2945 counting only the distinct ones).

The product of its (nonzero) digits is 10752, while the sum is 33.

The square root of 81248370 is about 9013.7877720745. The cubic root of 81248370 is about 433.1166563029.

It can be divided in two parts, 81248 and 370, that added together give a palindrome (81618).

The spelling of 81248370 in words is "eighty-one million, two hundred forty-eight thousand, three hundred seventy".