55768861 has 4 divisors (see below), whose sum is σ = 56532892. Its totient is φ = 55004832.

The previous prime is 55768849. The next prime is 55768871. The reversal of 55768861 is 16886755.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 48511225 + 7257636 = 6965^2 + 2694^2 .

It is a cyclic number.

It is not a de Polignac number, because 55768861 - 2¹³ = 55760669 is a prime.

It is a super-2 number, since 2×55768861² = 6220331714474642, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (55768871) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 381906 + ... + 382051.

It is an arithmetic number, because the mean of its divisors is an integer number (14133223).

Almost surely, 2^55768861 is an apocalyptic number.

It is an amenable number.

55768861 is a deficient number, since it is larger than the sum of its proper divisors (764031).

55768861 is an equidigital number, since it uses as much as digits as its factorization.

55768861 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 764030.

The product of its digits is 403200, while the sum is 46.

The square root of 55768861 is about 7467.8551807062. The cubic root of 55768861 is about 382.0591380716.

The spelling of 55768861 in words is "fifty-five million, seven hundred sixty-eight thousand, eight hundred sixty-one".