55639418 has 8 divisors (see below), whose sum is σ = 84397140. Its totient is φ = 27507040.

The previous prime is 55639417. The next prime is 55639427. The reversal of 55639418 is 81493655.

It can be written as a sum of positive squares in 2 ways, for example, as 53246209 + 2393209 = 7297^2 + 1547^2 .

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

It is not an unprimeable number, because it can be changed into a prime (55639417) 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, 156113 + ... + 156468.

Almost surely, 2^55639418 is an apocalyptic number.

55639418 is a deficient number, since it is larger than the sum of its proper divisors (28757722).

55639418 is a wasteful number, since it uses less digits than its factorization.

55639418 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 312672.

The product of its digits is 129600, while the sum is 41.

The square root of 55639418 is about 7459.1834673776. The cubic root of 55639418 is about 381.7633147265.

The spelling of 55639418 in words is "fifty-five million, six hundred thirty-nine thousand, four hundred eighteen".