72163455 has 64 divisors (see below), whose sum is σ = 147087360. Its totient is φ = 29385216.

The previous prime is 72163451. The next prime is 72163457. The reversal of 72163455 is 55436127.

It is not a de Polignac number, because 72163455 - 2² = 72163451 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (72163451) 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 63 ways as a sum of consecutive naturals, for example, 38674 + ... + 40496.

It is an arithmetic number, because the mean of its divisors is an integer number (2298240).

Almost surely, 2^72163455 is an apocalyptic number.

72163455 is an abundant number, since it is smaller than the sum of its proper divisors (74923905).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

72163455 is a wasteful number, since it uses less digits than its factorization.

72163455 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1880.

The product of its digits is 25200, while the sum is 33.

The square root of 72163455 is about 8494.9075921990. The cubic root of 72163455 is about 416.3313415872.

The spelling of 72163455 in words is "seventy-two million, one hundred sixty-three thousand, four hundred fifty-five".