55678320 has 160 divisors (see below), whose sum is σ = 194184000. Its totient is φ = 14662656.

The previous prime is 55678313. The next prime is 55678321. The reversal of 55678320 is 2387655.

55678320 is a `hidden beast` number, since 556 + 7 + 83 + 20 = 666.

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 (55678321) 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, 321754 + ... + 321926.

It is an arithmetic number, because the mean of its divisors is an integer number (1213650).

Almost surely, 2^55678320 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 55678320, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (97092000).

55678320 is an abundant number, since it is smaller than the sum of its proper divisors (138505680).

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

55678320 is a wasteful number, since it uses less digits than its factorization.

55678320 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 344 (or 332 counting only the distinct ones).

The product of its (nonzero) digits is 50400, while the sum is 36.

The square root of 55678320 is about 7461.7906698057. The cubic root of 55678320 is about 381.8522678289.

The spelling of 55678320 in words is "fifty-five million, six hundred seventy-eight thousand, three hundred twenty".