53681818 has 8 divisors (see below), whose sum is σ = 85259412. Its totient is φ = 25262016.

The previous prime is 53681809. The next prime is 53681819. The reversal of 53681818 is 81818635.

It can be written as a sum of positive squares in 2 ways, for example, as 50594769 + 3087049 = 7113^2 + 1757^2 .

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

It is a super-3 number, since 3×53681818³ (a number of 24 digits) contains 333 as substring.

It is not an unprimeable number, because it can be changed into a prime (53681819) 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, 789405 + ... + 789472.

Almost surely, 2^53681818 is an apocalyptic number.

53681818 is a deficient number, since it is larger than the sum of its proper divisors (31577594).

53681818 is a wasteful number, since it uses less digits than its factorization.

53681818 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1578896.

The product of its digits is 46080, while the sum is 40.

The square root of 53681818 is about 7326.7876999405. The cubic root of 53681818 is about 377.2324739345.

The spelling of 53681818 in words is "fifty-three million, six hundred eighty-one thousand, eight hundred eighteen".