72316730 has 16 divisors (see below), whose sum is σ = 130834440. Its totient is φ = 28779072.

The previous prime is 72316729. The next prime is 72316733. The reversal of 72316730 is 3761327.

It can be written as a sum of positive squares in 4 ways, for example, as 70274689 + 2042041 = 8383^2 + 1429^2 .

It is a junction number, because it is equal to n+sod(n) for n = 72316693 and 72316702.

It is not an unprimeable number, because it can be changed into a prime (72316733) 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, 16385 + ... + 20324.

Almost surely, 2^72316730 is an apocalyptic number.

72316730 is a deficient number, since it is larger than the sum of its proper divisors (58517710).

72316730 is a wasteful number, since it uses less digits than its factorization.

72316730 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 36913.

The product of its (nonzero) digits is 5292, while the sum is 29.

The square root of 72316730 is about 8503.9243881869. The cubic root of 72316730 is about 416.6258953884.

The spelling of 72316730 in words is "seventy-two million, three hundred sixteen thousand, seven hundred thirty".