81657348 has 48 divisors (see below), whose sum is σ = 197750784. Its totient is φ = 26197920.

The previous prime is 81657311. The next prime is 81657403. The reversal of 81657348 is 84375618.

It is a hoax number, since the sum of its digits (42) coincides with the sum of the digits of its distinct prime factors.

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, 83961 + ... + 84927.

It is an arithmetic number, because the mean of its divisors is an integer number (4119808).

Almost surely, 2^81657348 is an apocalyptic number.

It is an amenable number.

81657348 is an abundant number, since it is smaller than the sum of its proper divisors (116093436).

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

81657348 is a wasteful number, since it uses less digits than its factorization.

81657348 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1232 (or 1230 counting only the distinct ones).

The product of its digits is 161280, while the sum is 42.

The square root of 81657348 is about 9036.4455401446. The cubic root of 81657348 is about 433.8421633644.

The spelling of 81657348 in words is "eighty-one million, six hundred fifty-seven thousand, three hundred forty-eight".