72163540 has 24 divisors (see below), whose sum is σ = 151855200. Its totient is φ = 28806048.

The previous prime is 72163537. The next prime is 72163541. The reversal of 72163540 is 4536127.

It is a junction number, because it is equal to n+sod(n) for n = 72163499 and 72163508.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (72163541) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 7011 + ... + 13909.

It is an arithmetic number, because the mean of its divisors is an integer number (6327300).

Almost surely, 2^72163540 is an apocalyptic number.

It is an amenable number.

72163540 is an abundant number, since it is smaller than the sum of its proper divisors (79691660).

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

72163540 is a wasteful number, since it uses less digits than its factorization.

72163540 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7431 (or 7429 counting only the distinct ones).

The product of its (nonzero) digits is 5040, while the sum is 28.

The square root of 72163540 is about 8494.9125951948. The cubic root of 72163540 is about 416.3315050501.

Adding to 72163540 its reverse (4536127), we get a palindrome (76699667).

It can be divided in two parts, 721 and 63540, that added together give a triangular number (64261 = T₃₅₈).

The spelling of 72163540 in words is "seventy-two million, one hundred sixty-three thousand, five hundred forty".