81248270 has 32 divisors (see below), whose sum is σ = 156994848. Its totient is φ = 30163968.

The previous prime is 81248269. The next prime is 81248281. The reversal of 81248270 is 7284218.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 9137 + ... + 15683.

It is an arithmetic number, because the mean of its divisors is an integer number (4906089).

Almost surely, 2^81248270 is an apocalyptic number.

81248270 is a deficient number, since it is larger than the sum of its proper divisors (75746578).

81248270 is a wasteful number, since it uses less digits than its factorization.

81248270 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6644.

The product of its (nonzero) digits is 7168, while the sum is 32.

The square root of 81248270 is about 9013.7822250152. The cubic root of 81248270 is about 433.1164786104.

It can be divided in two parts, 81248 and 270, that added together give a palindrome (81518).

The spelling of 81248270 in words is "eighty-one million, two hundred forty-eight thousand, two hundred seventy".