72221265 has 24 divisors (see below), whose sum is σ = 130628160. Its totient is φ = 36842784.

The previous prime is 72221257. The next prime is 72221269. The reversal of 72221265 is 56212227.

It is not a de Polignac number, because 72221265 - 2³ = 72221257 is a prime.

It is a super-2 number, since 2×72221265² = 10431822236400450, which contains 22 as substring.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (72221269) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 33855 + ... + 35924.

It is an arithmetic number, because the mean of its divisors is an integer number (5442840).

Almost surely, 2^72221265 is an apocalyptic number.

It is an amenable number.

72221265 is a deficient number, since it is larger than the sum of its proper divisors (58406895).

72221265 is a wasteful number, since it uses less digits than its factorization.

72221265 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 69813 (or 69810 counting only the distinct ones).

The product of its digits is 3360, while the sum is 27.

The square root of 72221265 is about 8498.3095377846. The cubic root of 72221265 is about 416.4424859827.

The spelling of 72221265 in words is "seventy-two million, two hundred twenty-one thousand, two hundred sixty-five".