72265555 has 16 divisors (see below), whose sum is σ = 93778560. Its totient is φ = 53251072.

The previous prime is 72265549. The next prime is 72265559. The reversal of 72265555 is 55556227.

It is a happy number.

It is not a de Polignac number, because 72265555 - 2¹¹ = 72263507 is a prime.

It is not an unprimeable number, because it can be changed into a prime (72265559) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 5050 + ... + 13039.

It is an arithmetic number, because the mean of its divisors is an integer number (5861160).

Almost surely, 2^72265555 is an apocalyptic number.

72265555 is a deficient number, since it is larger than the sum of its proper divisors (21513005).

72265555 is a wasteful number, since it uses less digits than its factorization.

72265555 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18158.

The product of its digits is 105000, while the sum is 37.

The square root of 72265555 is about 8500.9149507568. The cubic root of 72265555 is about 416.5275969660.

The spelling of 72265555 in words is "seventy-two million, two hundred sixty-five thousand, five hundred fifty-five".