72779225 has 6 divisors (see below), whose sum is σ = 90246270. Its totient is φ = 58223360.

The previous prime is 72779209. The next prime is 72779233. The reversal of 72779225 is 52297727.

It can be written as a sum of positive squares in 3 ways, for example, as 52441 + 72726784 = 229^2 + 8528^2 .

It is not a de Polignac number, because 72779225 - 2⁴ = 72779209 is a prime.

It is a Curzon number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1455560 + ... + 1455609.

It is an arithmetic number, because the mean of its divisors is an integer number (15041045).

Almost surely, 2^72779225 is an apocalyptic number.

It is an amenable number.

72779225 is a deficient number, since it is larger than the sum of its proper divisors (17467045).

72779225 is a wasteful number, since it uses less digits than its factorization.

72779225 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2911179 (or 2911174 counting only the distinct ones).

The product of its digits is 123480, while the sum is 41.

The square root of 72779225 is about 8531.0740824353. The cubic root of 72779225 is about 417.5121729033.

The spelling of 72779225 in words is "seventy-two million, seven hundred seventy-nine thousand, two hundred twenty-five".