55777889 has 4 divisors (see below), whose sum is σ = 56830356. Its totient is φ = 54725424.

The previous prime is 55777879. The next prime is 55777903. The reversal of 55777889 is 98877755.

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 45792289 + 9985600 = 6767^2 + 3160^2 .

It is a cyclic number.

It is not a de Polignac number, because 55777889 - 2⁴ = 55777873 is a prime.

It is a super-2 number, since 2×55777889² = 6222345802592642, which contains 22 as substring.

It is a Duffinian number.

It is a plaindrome in base 10.

It is not an unprimeable number, because it can be changed into a prime (55777819) 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, 526154 + ... + 526259.

It is an arithmetic number, because the mean of its divisors is an integer number (14207589).

Almost surely, 2^55777889 is an apocalyptic number.

It is an amenable number.

55777889 is a deficient number, since it is larger than the sum of its proper divisors (1052467).

55777889 is a wasteful number, since it uses less digits than its factorization.

55777889 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1052466.

The product of its digits is 4939200, while the sum is 56.

The square root of 55777889 is about 7468.4596136017. The cubic root of 55777889 is about 382.0797531827.

The spelling of 55777889 in words is "fifty-five million, seven hundred seventy-seven thousand, eight hundred eighty-nine".