72605945 has 4 divisors (see below), whose sum is σ = 87127140. Its totient is φ = 58084752.

The previous prime is 72605941. The next prime is 72605947. The reversal of 72605945 is 54950627.

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 37405456 + 35200489 = 6116^2 + 5933^2 .

It is a cyclic number.

It is not a de Polignac number, because 72605945 - 2² = 72605941 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 72605899 and 72605908.

It is not an unprimeable number, because it can be changed into a prime (72605941) 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, 7260590 + ... + 7260599.

It is an arithmetic number, because the mean of its divisors is an integer number (21781785).

Almost surely, 2^72605945 is an apocalyptic number.

It is an amenable number.

72605945 is a deficient number, since it is larger than the sum of its proper divisors (14521195).

72605945 is a wasteful number, since it uses less digits than its factorization.

72605945 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14521194.

The product of its (nonzero) digits is 75600, while the sum is 38.

The square root of 72605945 is about 8520.9122164238. The cubic root of 72605945 is about 417.1805581146.

The spelling of 72605945 in words is "seventy-two million, six hundred five thousand, nine hundred forty-five".