72703181 has 4 divisors (see below), whose sum is σ = 72734172. Its totient is φ = 72672192.

The previous prime is 72703151. The next prime is 72703199. The reversal of 72703181 is 18130727.

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 29800681 + 42902500 = 5459^2 + 6550^2 .

It is a cyclic number.

It is not a de Polignac number, because 72703181 - 2²² = 68508877 is a prime.

It is a super-2 number, since 2×72703181² = 10571505055037522, which contains 22 as substring.

It is a Duffinian number.

It is a plaindrome in base 16.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (72703151) 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, 11660 + ... + 16773.

It is an arithmetic number, because the mean of its divisors is an integer number (18183543).

Almost surely, 2^72703181 is an apocalyptic number.

It is an amenable number.

72703181 is a deficient number, since it is larger than the sum of its proper divisors (30991).

72703181 is a wasteful number, since it uses less digits than its factorization.

72703181 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30990.

The product of its (nonzero) digits is 2352, while the sum is 29.

The square root of 72703181 is about 8526.6160345122. The cubic root of 72703181 is about 417.3667084985.

The spelling of 72703181 in words is "seventy-two million, seven hundred three thousand, one hundred eighty-one".