82782785281 has 16 divisors (see below), whose sum is σ = 99638501760. Its totient is φ = 67188234240.

The previous prime is 82782785269. The next prime is 82782785297. The reversal of 82782785281 is 18258728728.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 82782785281 - 2⁷ = 82782785153 is a prime.

It is a super-2 number, since 2×82782785281² (a number of 23 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (82782785381) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 109761 + ... + 421441.

It is an arithmetic number, because the mean of its divisors is an integer number (6227406360).

Almost surely, 2^82782785281 is an apocalyptic number.

It is an amenable number.

82782785281 is a deficient number, since it is larger than the sum of its proper divisors (16855716479).

82782785281 is a wasteful number, since it uses less digits than its factorization.

82782785281 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 313704.

The product of its digits is 8028160, while the sum is 58.

The spelling of 82782785281 in words is "eighty-two billion, seven hundred eighty-two million, seven hundred eighty-five thousand, two hundred eighty-one".