81480817 has 8 divisors (see below), whose sum is σ = 91056672. Its totient is φ = 72266400.

The previous prime is 81480793. The next prime is 81480857. The reversal of 81480817 is 71808418.

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

It is a cyclic number.

It is not a de Polignac number, because 81480817 - 2¹¹ = 81478769 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (81480857) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 89883 + ... + 90784.

It is an arithmetic number, because the mean of its divisors is an integer number (11382084).

Almost surely, 2^81480817 is an apocalyptic number.

It is an amenable number.

81480817 is a deficient number, since it is larger than the sum of its proper divisors (9575855).

81480817 is a wasteful number, since it uses less digits than its factorization.

81480817 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 180719.

The product of its (nonzero) digits is 14336, while the sum is 37.

The square root of 81480817 is about 9026.6725320020. The cubic root of 81480817 is about 433.5293038002.

The spelling of 81480817 in words is "eighty-one million, four hundred eighty thousand, eight hundred seventeen".