53307218 has 4 divisors (see below), whose sum is σ = 79960830. Its totient is φ = 26653608.

The previous prime is 53307211. The next prime is 53307227. The reversal of 53307218 is 81270335.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 81270335 = 5 ⋅16254067.

It can be written as a sum of positive squares in only one way, i.e., 53246209 + 61009 = 7297^2 + 247^2 .

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (53307211) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 13326803 + ... + 13326806.

Almost surely, 2^53307218 is an apocalyptic number.

53307218 is a deficient number, since it is larger than the sum of its proper divisors (26653612).

53307218 is a wasteful number, since it uses less digits than its factorization.

53307218 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26653611.

The product of its (nonzero) digits is 5040, while the sum is 29.

The square root of 53307218 is about 7301.1792198247. The cubic root of 53307218 is about 376.3529628477.

The spelling of 53307218 in words is "fifty-three million, three hundred seven thousand, two hundred eighteen".