82781725 has 12 divisors (see below), whose sum is σ = 110545876. Its totient is φ = 61130880.

The previous prime is 82781717. The next prime is 82781729. The reversal of 82781725 is 52718728.

It can be written as a sum of positive squares in 6 ways, for example, as 2105401 + 80676324 = 1451^2 + 8982^2 .

It is not a de Polignac number, because 82781725 - 2³ = 82781717 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 (82781729) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 127032 + ... + 127681.

Almost surely, 2^82781725 is an apocalyptic number.

It is an amenable number.

82781725 is a deficient number, since it is larger than the sum of its proper divisors (27764151).

82781725 is a wasteful number, since it uses less digits than its factorization.

82781725 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 254736 (or 254731 counting only the distinct ones).

The product of its digits is 62720, while the sum is 40.

The square root of 82781725 is about 9098.4462959343. The cubic root of 82781725 is about 435.8243495385.

The spelling of 82781725 in words is "eighty-two million, seven hundred eighty-one thousand, seven hundred twenty-five".