72820225 has 12 divisors (see below), whose sum is σ = 91442560. Its totient is φ = 57517200.

The previous prime is 72820213. The next prime is 72820259. The reversal of 72820225 is 52202827.

It is not a de Polignac number, because 72820225 - 2¹⁷ = 72689153 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 72820193 and 72820202.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 16461 + ... + 20410.

Almost surely, 2^72820225 is an apocalyptic number.

It is an amenable number.

72820225 is a deficient number, since it is larger than the sum of its proper divisors (18622335).

72820225 is a wasteful number, since it uses less digits than its factorization.

72820225 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 36960 (or 36955 counting only the distinct ones).

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

The square root of 72820225 is about 8533.4767240557. The cubic root of 72820225 is about 417.5905596757.

The spelling of 72820225 in words is "seventy-two million, eight hundred twenty thousand, two hundred twenty-five".