55917216 has 192 divisors, whose sum is σ = 178536960. Its totient is φ = 17169408.

The previous prime is 55917203. The next prime is 55917217. The reversal of 55917216 is 61271955.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (55917217) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1189705 + ... + 1189751.

It is an arithmetic number, because the mean of its divisors is an integer number (929880).

Almost surely, 2^55917216 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 55917216, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (89268480).

55917216 is an abundant number, since it is smaller than the sum of its proper divisors (122619744).

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

55917216 is an equidigital number, since it uses as much as digits as its factorization.

55917216 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 95 (or 69 counting only the distinct ones).

The product of its digits is 18900, while the sum is 36.

The square root of 55917216 is about 7477.7814891851. The cubic root of 55917216 is about 382.3976196580.

The spelling of 55917216 in words is "fifty-five million, nine hundred seventeen thousand, two hundred sixteen".