55609040 has 80 divisors (see below), whose sum is σ = 141419520. Its totient is φ = 20244480.

The previous prime is 55609027. The next prime is 55609049. The reversal of 55609040 is 4090655.

It is a tau number, because it is divible by the number of its divisors (80).

It is a junction number, because it is equal to n+sod(n) for n = 55608994 and 55609012.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (55609049) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 41501 + ... + 42819.

It is an arithmetic number, because the mean of its divisors is an integer number (1767744).

Almost surely, 2^55609040 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 55609040, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (70709760).

55609040 is an abundant number, since it is smaller than the sum of its proper divisors (85810480).

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

55609040 is a wasteful number, since it uses less digits than its factorization.

55609040 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1380 (or 1374 counting only the distinct ones).

The product of its (nonzero) digits is 5400, while the sum is 29.

The square root of 55609040 is about 7457.1469074975. The cubic root of 55609040 is about 381.6938237214.

Adding to 55609040 its reverse (4090655), we get a palindrome (59699695).

The spelling of 55609040 in words is "fifty-five million, six hundred nine thousand, forty".