55609140 has 24 divisors (see below), whose sum is σ = 155705760. Its totient is φ = 14829088.

The previous prime is 55609139. The next prime is 55609171. The reversal of 55609140 is 4190655.

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 = 55609098 and 55609107.

It is a congruent number.

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 7 ways as a sum of consecutive naturals, for example, 463350 + ... + 463469.

It is an arithmetic number, because the mean of its divisors is an integer number (6487740).

Almost surely, 2^55609140 is an apocalyptic number.

It is an amenable number.

55609140 is an abundant number, since it is smaller than the sum of its proper divisors (100096620).

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

55609140 is a wasteful number, since it uses less digits than its factorization.

55609140 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 926831 (or 926829 counting only the distinct ones).

The product of its (nonzero) digits is 5400, while the sum is 30.

The square root of 55609140 is about 7457.1536124717. The cubic root of 55609140 is about 381.6940525173.

Adding to 55609140 its reverse (4190655), we get a palindrome (59799795).

The spelling of 55609140 in words is "fifty-five million, six hundred nine thousand, one hundred forty".