81480877 has 4 divisors (see below), whose sum is σ = 81559456. Its totient is φ = 81402300.

The previous prime is 81480863. The next prime is 81480901. The reversal of 81480877 is 77808418.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 77808418 = 2 ⋅38904209.

It is a cyclic number.

It is not a de Polignac number, because 81480877 - 2¹¹ = 81478829 is a prime.

It is a Duffinian number.

It is a congruent 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 3 ways as a sum of consecutive naturals, for example, 37713 + ... + 39814.

It is an arithmetic number, because the mean of its divisors is an integer number (20389864).

Almost surely, 2^81480877 is an apocalyptic number.

It is an amenable number.

81480877 is a deficient number, since it is larger than the sum of its proper divisors (78579).

81480877 is a wasteful number, since it uses less digits than its factorization.

81480877 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 78578.

The product of its (nonzero) digits is 100352, while the sum is 43.

The square root of 81480877 is about 9026.6758554852. The cubic root of 81480877 is about 433.5294102128.

The spelling of 81480877 in words is "eighty-one million, four hundred eighty thousand, eight hundred seventy-seven".