81240348 has 48 divisors (see below), whose sum is σ = 229388544. Its totient is φ = 21845760.

The previous prime is 81240319. The next prime is 81240359. The reversal of 81240348 is 84304218.

It is a super-2 number, since 2×81240348² = 13199988286322208, which contains 22 as substring.

It is a congruent number.

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 15 ways as a sum of consecutive naturals, for example, 27018 + ... + 29873.

It is an arithmetic number, because the mean of its divisors is an integer number (4778928).

Almost surely, 2^81240348 is an apocalyptic number.

It is an amenable number.

81240348 is an abundant number, since it is smaller than the sum of its proper divisors (148148196).

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

81240348 is a wasteful number, since it uses less digits than its factorization.

81240348 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 56922 (or 56920 counting only the distinct ones).

The product of its (nonzero) digits is 6144, while the sum is 30.

The square root of 81240348 is about 9013.3427761292. The cubic root of 81240348 is about 433.1024013454.

The spelling of 81240348 in words is "eighty-one million, two hundred forty thousand, three hundred forty-eight".