72169232 has 10 divisors (see below), whose sum is σ = 139827918. Its totient is φ = 36084608.

The previous prime is 72169231. The next prime is 72169241. The reversal of 72169232 is 23296127.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 62031376 + 10137856 = 7876^2 + 3184^2 .

It is an alternating number because its digits alternate between odd and even.

It is not an unprimeable number, because it can be changed into a prime (72169231) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2255273 + ... + 2255304.

Almost surely, 2^72169232 is an apocalyptic number.

It is an amenable number.

72169232 is a deficient number, since it is larger than the sum of its proper divisors (67658686).

72169232 is a wasteful number, since it uses less digits than its factorization.

72169232 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4510585 (or 4510579 counting only the distinct ones).

The product of its digits is 9072, while the sum is 32.

The square root of 72169232 is about 8495.2476126361. The cubic root of 72169232 is about 416.3424510053.

The spelling of 72169232 in words is "seventy-two million, one hundred sixty-nine thousand, two hundred thirty-two".