72609945 has 8 divisors (see below), whose sum is σ = 116175936. Its totient is φ = 38725296.

The previous prime is 72609937. The next prime is 72609949. The reversal of 72609945 is 54990627.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 72609945 - 2³ = 72609937 is a prime.

It is a super-2 number, since 2×72609945² = 10544408225806050, which contains 22 as substring.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 72609897 and 72609906.

It is not an unprimeable number, because it can be changed into a prime (72609949) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2420317 + ... + 2420346.

It is an arithmetic number, because the mean of its divisors is an integer number (14521992).

Almost surely, 2^72609945 is an apocalyptic number.

It is an amenable number.

72609945 is a deficient number, since it is larger than the sum of its proper divisors (43565991).

72609945 is a wasteful number, since it uses less digits than its factorization.

72609945 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4840671.

The product of its (nonzero) digits is 136080, while the sum is 42.

The square root of 72609945 is about 8521.1469298446. The cubic root of 72609945 is about 417.1882190648.

It can be divided in two parts, 7260 and 9945, that added together give a triangular number (17205 = T₁₈₅).

The spelling of 72609945 in words is "seventy-two million, six hundred nine thousand, nine hundred forty-five".