81258745 has 8 divisors (see below), whose sum is σ = 97560000. Its totient is φ = 64974000.

The previous prime is 81258733. The next prime is 81258767. The reversal of 81258745 is 54785218.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 81258745 - 2¹⁹ = 80734457 is a prime.

It is an alternating number because its digits alternate between even and odd.

It is a junction number, because it is equal to n+sod(n) for n = 81258698 and 81258707.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 13756 + ... + 18754.

It is an arithmetic number, because the mean of its divisors is an integer number (12195000).

Almost surely, 2^81258745 is an apocalyptic number.

It is an amenable number.

81258745 is a deficient number, since it is larger than the sum of its proper divisors (16301255).

81258745 is a wasteful number, since it uses less digits than its factorization.

81258745 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8255.

The product of its digits is 89600, while the sum is 40.

The square root of 81258745 is about 9014.3632609297. The cubic root of 81258745 is about 433.1350911099.

The spelling of 81258745 in words is "eighty-one million, two hundred fifty-eight thousand, seven hundred forty-five".