72163553 has 12 divisors (see below), whose sum is σ = 90652800. Its totient is φ = 56230680.

The previous prime is 72163547. The next prime is 72163561. The reversal of 72163553 is 35536127.

It is not a de Polignac number, because 72163553 - 2⁴ = 72163537 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (72163543) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 41753 + ... + 43446.

It is an arithmetic number, because the mean of its divisors is an integer number (7554400).

Almost surely, 2^72163553 is an apocalyptic number.

It is an amenable number.

72163553 is a deficient number, since it is larger than the sum of its proper divisors (18489247).

72163553 is a wasteful number, since it uses less digits than its factorization.

72163553 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 85228 (or 85217 counting only the distinct ones).

The product of its digits is 18900, while the sum is 32.

The square root of 72163553 is about 8494.9133603587. The cubic root of 72163553 is about 416.3315300503.

The spelling of 72163553 in words is "seventy-two million, one hundred sixty-three thousand, five hundred fifty-three".