55643340 has 48 divisors (see below), whose sum is σ = 156215808. Its totient is φ = 14798784.

The previous prime is 55643311. The next prime is 55643353. The reversal of 55643340 is 4334655.

It is a Smith number, since the sum of its digits (30) coincides with the sum of the digits of its prime factors.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a junction number, because it is equal to n+sod(n) for n = 55643298 and 55643307.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 26779 + ... + 28781.

It is an arithmetic number, because the mean of its divisors is an integer number (3254496).

Almost surely, 2^55643340 is an apocalyptic number.

It is an amenable number.

55643340 is an abundant number, since it is smaller than the sum of its proper divisors (100572468).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

55643340 is a wasteful number, since it uses less digits than its factorization.

55643340 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2478 (or 2476 counting only the distinct ones).

The product of its (nonzero) digits is 21600, while the sum is 30.

The square root of 55643340 is about 7459.4463601530. The cubic root of 55643340 is about 381.7722846294.

Adding to 55643340 its reverse (4334655), we get a palindrome (59977995).

The spelling of 55643340 in words is "fifty-five million, six hundred forty-three thousand, three hundred forty".