81315248 has 40 divisors (see below), whose sum is σ = 180488448. Its totient is φ = 34765632.

The previous prime is 81315229. The next prime is 81315251. The reversal of 81315248 is 84251318.

It is a super-2 number, since 2×81315248² = 13224339114603008, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 75965 + ... + 77027.

Almost surely, 2^81315248 is an apocalyptic number.

It is an amenable number.

81315248 is an abundant number, since it is smaller than the sum of its proper divisors (99173200).

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

81315248 is a wasteful number, since it uses less digits than its factorization.

81315248 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1761 (or 1755 counting only the distinct ones).

The product of its digits is 7680, while the sum is 32.

The square root of 81315248 is about 9017.4967701685. The cubic root of 81315248 is about 433.2354608680.

It can be divided in two parts, 813 and 15248, that added together give a palindrome (16061).

The spelling of 81315248 in words is "eighty-one million, three hundred fifteen thousand, two hundred forty-eight".