72163741 has 4 divisors (see below), whose sum is σ = 77714812. Its totient is φ = 66612672.

The previous prime is 72163723. The next prime is 72163747. The reversal of 72163741 is 14736127.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 31472100 + 40691641 = 5610^2 + 6379^2 .

It is a cyclic number.

It is not a de Polignac number, because 72163741 - 2⁵ = 72163709 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (72163747) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2775516 + ... + 2775541.

It is an arithmetic number, because the mean of its divisors is an integer number (19428703).

Almost surely, 2^72163741 is an apocalyptic number.

It is an amenable number.

72163741 is a deficient number, since it is larger than the sum of its proper divisors (5551071).

72163741 is a wasteful number, since it uses less digits than its factorization.

72163741 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5551070.

The product of its digits is 7056, while the sum is 31.

The square root of 72163741 is about 8494.9244257969. The cubic root of 72163741 is about 416.3318915914.

Adding to 72163741 its reverse (14736127), we get a palindrome (86899868).

The spelling of 72163741 in words is "seventy-two million, one hundred sixty-three thousand, seven hundred forty-one".