72171255 has 32 divisors (see below), whose sum is σ = 128378880. Its totient is φ = 34381440.

The previous prime is 72171251. The next prime is 72171259. The reversal of 72171255 is 55217127.

It is an interprime number because it is at equal distance from previous prime (72171251) and next prime (72171259).

It is not a de Polignac number, because 72171255 - 2² = 72171251 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (72171251) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 76 + ... + 12014.

It is an arithmetic number, because the mean of its divisors is an integer number (4011840).

Almost surely, 2^72171255 is an apocalyptic number.

72171255 is a deficient number, since it is larger than the sum of its proper divisors (56207625).

72171255 is a wasteful number, since it uses less digits than its factorization.

72171255 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11991.

The product of its digits is 4900, while the sum is 30.

The square root of 72171255 is about 8495.3666783724. The cubic root of 72171255 is about 416.3463411807.

The spelling of 72171255 in words is "seventy-two million, one hundred seventy-one thousand, two hundred fifty-five".