81548715 has 32 divisors (see below), whose sum is σ = 135012096. Its totient is φ = 42007680.

The previous prime is 81548689. The next prime is 81548723. The reversal of 81548715 is 51784518.

It is not a de Polignac number, because 81548715 - 2⁶ = 81548651 is a prime.

It is a Smith number, since the sum of its digits (39) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 52500 + ... + 54030.

It is an arithmetic number, because the mean of its divisors is an integer number (4219128).

Almost surely, 2^81548715 is an apocalyptic number.

81548715 is a deficient number, since it is larger than the sum of its proper divisors (53463381).

81548715 is a wasteful number, since it uses less digits than its factorization.

81548715 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1659.

The product of its digits is 44800, while the sum is 39.

The square root of 81548715 is about 9030.4327138848. The cubic root of 81548715 is about 433.6496904191.

The spelling of 81548715 in words is "eighty-one million, five hundred forty-eight thousand, seven hundred fifteen".