82560781 has 4 divisors (see below), whose sum is σ = 85224064. Its totient is φ = 79897500.

The previous prime is 82560739. The next prime is 82560787. The reversal of 82560781 is 18706528.

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.

It is a cyclic number.

It is not a de Polignac number, because 82560781 - 2¹¹ = 82558733 is a prime.

It is a super-2 number, since 2×82560781² = 13632565118659922, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 82560781.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (82560787) 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, 1331595 + ... + 1331656.

It is an arithmetic number, because the mean of its divisors is an integer number (21306016).

Almost surely, 2^82560781 is an apocalyptic number.

It is an amenable number.

82560781 is a deficient number, since it is larger than the sum of its proper divisors (2663283).

82560781 is a wasteful number, since it uses less digits than its factorization.

82560781 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2663282.

The product of its (nonzero) digits is 26880, while the sum is 37.

The square root of 82560781 is about 9086.2963301887. The cubic root of 82560781 is about 435.4362664173.

The spelling of 82560781 in words is "eighty-two million, five hundred sixty thousand, seven hundred eighty-one".