55559640 has 64 divisors (see below), whose sum is σ = 170242560. Its totient is φ = 14499200.

The previous prime is 55559627. The next prime is 55559641. The reversal of 55559640 is 4695555.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (55559641) 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, 715 + ... + 10565.

It is an arithmetic number, because the mean of its divisors is an integer number (2660040).

Almost surely, 2^55559640 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 55559640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (85121280).

55559640 is an abundant number, since it is smaller than the sum of its proper divisors (114682920).

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

55559640 is a wasteful number, since it uses less digits than its factorization.

55559640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9912 (or 9908 counting only the distinct ones).

The product of its (nonzero) digits is 135000, while the sum is 39.

The square root of 55559640 is about 7453.8339128263. The cubic root of 55559640 is about 381.5807649987.

The spelling of 55559640 in words is "fifty-five million, five hundred fifty-nine thousand, six hundred forty".