55651680 has 144 divisors (see below), whose sum is σ = 217080864. Its totient is φ = 12718080.

The previous prime is 55651679. The next prime is 55651699. The reversal of 55651680 is 8615655.

55651680 is a `hidden beast` number, since 5 + 565 + 16 + 80 = 666.

It is a tau number, because it is divible by the number of its divisors (144).

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

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 7320 + ... + 12840.

It is an arithmetic number, because the mean of its divisors is an integer number (1507506).

Almost surely, 2^55651680 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 55651680, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (108540432).

55651680 is an abundant number, since it is smaller than the sum of its proper divisors (161429184).

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

55651680 is a wasteful number, since it uses less digits than its factorization.

55651680 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5549 (or 5538 counting only the distinct ones).

The product of its (nonzero) digits is 36000, while the sum is 36.

The square root of 55651680 is about 7460.0053619284. The cubic root of 55651680 is about 381.7913574229.

The spelling of 55651680 in words is "fifty-five million, six hundred fifty-one thousand, six hundred eighty".