55717668 has 18 divisors (see below), whose sum is σ = 140841974. Its totient is φ = 18572544.

The previous prime is 55717667. The next prime is 55717679. The reversal of 55717668 is 86671755.

55717668 is a `hidden beast` number, since 5 + 571 + 76 + 6 + 8 = 666.

It can be written as a sum of positive squares in only one way, i.e., 53846244 + 1871424 = 7338^2 + 1368^2 .

It is a tau number, because it is divible by the number of its divisors (18).

It is not an unprimeable number, because it can be changed into a prime (55717667) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 773821 + ... + 773892.

Almost surely, 2^55717668 is an apocalyptic number.

It is an amenable number.

55717668 is an abundant number, since it is smaller than the sum of its proper divisors (85124306).

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

55717668 is a wasteful number, since it uses less digits than its factorization.

55717668 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1547723 (or 1547718 counting only the distinct ones).

The product of its digits is 352800, while the sum is 45.

The square root of 55717668 is about 7464.4268366700. The cubic root of 55717668 is about 381.9421986134.

It can be divided in two parts, 557 and 17668, that added together give a square (18225 = 135²).

The spelling of 55717668 in words is "fifty-five million, seven hundred seventeen thousand, six hundred sixty-eight".