72153569 has 4 divisors (see below), whose sum is σ = 72177300. Its totient is φ = 72129840.

The previous prime is 72153533. The next prime is 72153577. The reversal of 72153569 is 96535127.

It is a happy number.

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 50410000 + 21743569 = 7100^2 + 4663^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-72153569 is a prime.

It is a super-2 number, since 2×72153569² = 10412275038875522, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (72183569) 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, 6494 + ... + 13655.

It is an arithmetic number, because the mean of its divisors is an integer number (18044325).

Almost surely, 2^72153569 is an apocalyptic number.

It is an amenable number.

72153569 is a deficient number, since it is larger than the sum of its proper divisors (23731).

72153569 is a wasteful number, since it uses less digits than its factorization.

72153569 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23730.

The product of its digits is 56700, while the sum is 38.

The square root of 72153569 is about 8494.3256942503. The cubic root of 72153569 is about 416.3123290108.

The spelling of 72153569 in words is "seventy-two million, one hundred fifty-three thousand, five hundred sixty-nine".