55503616 has 72 divisors (see below), whose sum is σ = 129507840. Its totient is φ = 23245824.

The previous prime is 55503607. The next prime is 55503647. The reversal of 55503616 is 61630555.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 83895 + ... + 84553.

It is an arithmetic number, because the mean of its divisors is an integer number (1798720).

Almost surely, 2^55503616 is an apocalyptic number.

55503616 is a gapful number since it is divisible by the number (56) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 55503616, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (64753920).

55503616 is an abundant number, since it is smaller than the sum of its proper divisors (74004224).

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

55503616 is an equidigital number, since it uses as much as digits as its factorization.

55503616 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 729 (or 715 counting only the distinct ones).

The product of its (nonzero) digits is 13500, while the sum is 31.

The square root of 55503616 is about 7450.0748989524. The cubic root of 55503616 is about 381.4524652098.

The spelling of 55503616 in words is "fifty-five million, five hundred three thousand, six hundred sixteen".