72240136 has 8 divisors (see below), whose sum is σ = 135450270. Its totient is φ = 36120064.

The previous prime is 72240127. The next prime is 72240139. The reversal of 72240136 is 63104227.

It can be written as a sum of positive squares in only one way, i.e., 56160036 + 16080100 = 7494^2 + 4010^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is a self number, because there is not a number n which added to its sum of digits gives 72240136.

It is not an unprimeable number, because it can be changed into a prime (72240139) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4515001 + ... + 4515016.

Almost surely, 2^72240136 is an apocalyptic number.

It is an amenable number.

72240136 is a deficient number, since it is larger than the sum of its proper divisors (63210134).

72240136 is a wasteful number, since it uses less digits than its factorization.

72240136 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9030023 (or 9030019 counting only the distinct ones).

The product of its (nonzero) digits is 2016, while the sum is 25.

The square root of 72240136 is about 8499.4197449002. The cubic root of 72240136 is about 416.4787541639.

The spelling of 72240136 in words is "seventy-two million, two hundred forty thousand, one hundred thirty-six".