82640225 has 12 divisors (see below), whose sum is σ = 102910080. Its totient is φ = 65830800.

The previous prime is 82640221. The next prime is 82640231. The reversal of 82640225 is 52204628.

It is not a de Polignac number, because 82640225 - 2² = 82640221 is a prime.

It is not an unprimeable number, because it can be changed into a prime (82640221) 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, 941 + ... + 12890.

It is an arithmetic number, because the mean of its divisors is an integer number (8575840).

Almost surely, 2^82640225 is an apocalyptic number.

It is an amenable number.

82640225 is a deficient number, since it is larger than the sum of its proper divisors (20269855).

82640225 is a wasteful number, since it uses less digits than its factorization.

82640225 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14080 (or 14075 counting only the distinct ones).

The product of its (nonzero) digits is 7680, while the sum is 29.

The square root of 82640225 is about 9090.6669172289. Note that the first 3 decimals coincide. The cubic root of 82640225 is about 435.5758876298.

The spelling of 82640225 in words is "eighty-two million, six hundred forty thousand, two hundred twenty-five".