55691768 has 32 divisors (see below), whose sum is σ = 114808320. Its totient is φ = 25116000.

The previous prime is 55691759. The next prime is 55691789. The reversal of 55691768 is 86719655.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 9113 + ... + 13943.

It is an arithmetic number, because the mean of its divisors is an integer number (3587760).

Almost surely, 2^55691768 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 55691768, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (57404160).

55691768 is an abundant number, since it is smaller than the sum of its proper divisors (59116552).

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

55691768 is a wasteful number, since it uses less digits than its factorization.

55691768 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4979 (or 4975 counting only the distinct ones).

The product of its digits is 453600, while the sum is 47.

The square root of 55691768 is about 7462.6917395803. The cubic root of 55691768 is about 381.8830083154.

It can be divided in two parts, 5569 and 1768, that added together give a palindrome (7337).

The spelling of 55691768 in words is "fifty-five million, six hundred ninety-one thousand, seven hundred sixty-eight".