82785961 has 4 divisors (see below), whose sum is σ = 83243524. Its totient is φ = 82328400.

The previous prime is 82785959. The next prime is 82785973. The reversal of 82785961 is 16958728.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 2576025 + 80209936 = 1605^2 + 8956^2 .

It is a cyclic number.

It is not a de Polignac number, because 82785961 - 2¹ = 82785959 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (82785161) 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, 228510 + ... + 228871.

It is an arithmetic number, because the mean of its divisors is an integer number (20810881).

Almost surely, 2^82785961 is an apocalyptic number.

It is an amenable number.

82785961 is a deficient number, since it is larger than the sum of its proper divisors (457563).

82785961 is a wasteful number, since it uses less digits than its factorization.

82785961 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 457562.

The product of its digits is 241920, while the sum is 46.

The square root of 82785961 is about 9098.6790799544. The cubic root of 82785961 is about 435.8317832261.

The spelling of 82785961 in words is "eighty-two million, seven hundred eighty-five thousand, nine hundred sixty-one".