72165255 has 16 divisors (see below), whose sum is σ = 122256864. Its totient is φ = 36224000.

The previous prime is 72165251. The next prime is 72165271. The reversal of 72165255 is 55256127.

It is not a de Polignac number, because 72165255 - 2² = 72165251 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (72165251) by changing a digit.

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 15 ways as a sum of consecutive naturals, for example, 141246 + ... + 141755.

It is an arithmetic number, because the mean of its divisors is an integer number (7641054).

Almost surely, 2^72165255 is an apocalyptic number.

72165255 is a deficient number, since it is larger than the sum of its proper divisors (50091609).

72165255 is a wasteful number, since it uses less digits than its factorization.

72165255 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 283026.

The product of its digits is 21000, while the sum is 33.

The square root of 72165255 is about 8495.0135373641. The cubic root of 72165255 is about 416.3348031278.

The spelling of 72165255 in words is "seventy-two million, one hundred sixty-five thousand, two hundred fifty-five".