45047218 has 4 divisors (see below), whose sum is σ = 67570830. Its totient is φ = 22523608.

The previous prime is 45047213. The next prime is 45047227. The reversal of 45047218 is 81274054.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 31775769 + 13271449 = 5637^2 + 3643^2 .

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a self number, because there is not a number n which added to its sum of digits gives 45047218.

It is not an unprimeable number, because it can be changed into a prime (45047213) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11261803 + ... + 11261806.

Almost surely, 2^45047218 is an apocalyptic number.

45047218 is a deficient number, since it is larger than the sum of its proper divisors (22523612).

45047218 is a wasteful number, since it uses less digits than its factorization.

45047218 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22523611.

The product of its (nonzero) digits is 8960, while the sum is 31.

The square root of 45047218 is about 6711.7224316862. The cubic root of 45047218 is about 355.8136939155.

The spelling of 45047218 in words is "forty-five million, forty-seven thousand, two hundred eighteen".