72280225 has 12 divisors (see below), whose sum is σ = 89955180. Its totient is φ = 57612800.

The previous prime is 72280223. The next prime is 72280261. The reversal of 72280225 is 52208227.

It can be written as a sum of positive squares in 6 ways, for example, as 2122849 + 70157376 = 1457^2 + 8376^2 .

It is not a de Polignac number, because 72280225 - 2¹ = 72280223 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 72280193 and 72280202.

It is not an unprimeable number, because it can be changed into a prime (72280223) 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, 1881 + ... + 12169.

It is an arithmetic number, because the mean of its divisors is an integer number (7496265).

Almost surely, 2^72280225 is an apocalyptic number.

It is an amenable number.

72280225 is a deficient number, since it is larger than the sum of its proper divisors (17674955).

72280225 is a wasteful number, since it uses less digits than its factorization.

72280225 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10580 (or 10575 counting only the distinct ones).

The product of its (nonzero) digits is 4480, while the sum is 28.

The square root of 72280225 is about 8501.7777552698. Note that the first 4 decimals coincide. The cubic root of 72280225 is about 416.5557802705. Note that the first 3 decimals are identical.

The spelling of 72280225 in words is "seventy-two million, two hundred eighty thousand, two hundred twenty-five".