55321560 has 192 divisors, whose sum is σ = 212846400. Its totient is φ = 12192768.

The previous prime is 55321547. The next prime is 55321573. The reversal of 55321560 is 6512355.

It is an interprime number because it is at equal distance from previous prime (55321547) and next prime (55321573).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 72702 + ... + 73458.

It is an arithmetic number, because the mean of its divisors is an integer number (1108575).

Almost surely, 2^55321560 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 55321560, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (106423200).

55321560 is an abundant number, since it is smaller than the sum of its proper divisors (157524840).

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

55321560 is a wasteful number, since it uses less digits than its factorization.

55321560 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 810 (or 803 counting only the distinct ones).

The product of its (nonzero) digits is 4500, while the sum is 27.

The square root of 55321560 is about 7437.8464625186. The cubic root of 55321560 is about 381.0349441982.

The spelling of 55321560 in words is "fifty-five million, three hundred twenty-one thousand, five hundred sixty".