72205156 has 6 divisors (see below), whose sum is σ = 126359030. Its totient is φ = 36102576.

The previous prime is 72205153. The next prime is 72205193. The reversal of 72205156 is 65150227.

It can be written as a sum of positive squares in only one way, i.e., 59814756 + 12390400 = 7734^2 + 3520^2 .

It is not an unprimeable number, because it can be changed into a prime (72205153) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9025641 + ... + 9025648.

Almost surely, 2^72205156 is an apocalyptic number.

It is an amenable number.

72205156 is a deficient number, since it is larger than the sum of its proper divisors (54153874).

72205156 is a wasteful number, since it uses less digits than its factorization.

72205156 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18051293 (or 18051291 counting only the distinct ones).

The product of its (nonzero) digits is 4200, while the sum is 28.

The square root of 72205156 is about 8497.3617082010. The cubic root of 72205156 is about 416.4115210914.

It can be divided in two parts, 72205 and 156, that added together give a square (72361 = 269²).

The spelling of 72205156 in words is "seventy-two million, two hundred five thousand, one hundred fifty-six".