82779225 has 12 divisors (see below), whose sum is σ = 136861776. Its totient is φ = 44148880.

The previous prime is 82779217. The next prime is 82779227. The reversal of 82779225 is 52297728.

It is a happy number.

It is not a de Polignac number, because 82779225 - 2³ = 82779217 is a prime.

It is not an unprimeable number, because it can be changed into a prime (82779227) 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, 551787 + ... + 551936.

It is an arithmetic number, because the mean of its divisors is an integer number (11405148).

Almost surely, 2^82779225 is an apocalyptic number.

It is an amenable number.

82779225 is a deficient number, since it is larger than the sum of its proper divisors (54082551).

82779225 is a wasteful number, since it uses less digits than its factorization.

82779225 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1103736 (or 1103731 counting only the distinct ones).

The product of its digits is 141120, while the sum is 42.

The square root of 82779225 is about 9098.3089088028. The cubic root of 82779225 is about 435.8199622100.

The spelling of 82779225 in words is "eighty-two million, seven hundred seventy-nine thousand, two hundred twenty-five".