55686664 has 64 divisors (see below), whose sum is σ = 119232000. Its totient is φ = 24153600.

The previous prime is 55686637. The next prime is 55686667. The reversal of 55686664 is 46668655.

It is not an unprimeable number, because it can be changed into a prime (55686667) by changing a digit.

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 15 ways as a sum of consecutive naturals, for example, 373662 + ... + 373810.

It is an arithmetic number, because the mean of its divisors is an integer number (1863000).

Almost surely, 2^55686664 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 55686664, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (59616000).

55686664 is an abundant number, since it is smaller than the sum of its proper divisors (63545336).

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

55686664 is a wasteful number, since it uses less digits than its factorization.

55686664 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 334 (or 330 counting only the distinct ones).

The product of its digits is 1036800, while the sum is 46.

The square root of 55686664 is about 7462.3497639819. The cubic root of 55686664 is about 381.8713417771.

Subtracting from 55686664 its reverse (46668655), we obtain a square (9018009 = 3003²).

The spelling of 55686664 in words is "fifty-five million, six hundred eighty-six thousand, six hundred sixty-four".