55777878 has 48 divisors (see below), whose sum is σ = 130712400. Its totient is φ = 17088192.

The previous prime is 55777873. The next prime is 55777879. The reversal of 55777878 is 87877755.

55777878 is a `hidden beast` number, since 557 + 7 + 7 + 87 + 8 = 666.

55777878 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a super-2 number, since 2×55777878² = 6222343348365768, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (55777873) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 81325 + ... + 82007.

It is an arithmetic number, because the mean of its divisors is an integer number (2723175).

Almost surely, 2^55777878 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 55777878, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (65356200).

55777878 is an abundant number, since it is smaller than the sum of its proper divisors (74934522).

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

55777878 is a wasteful number, since it uses less digits than its factorization.

55777878 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1053 (or 1050 counting only the distinct ones).

The product of its digits is 3841600, while the sum is 54.

The square root of 55777878 is about 7468.4588771714. The cubic root of 55777878 is about 382.0797280659.

The spelling of 55777878 in words is "fifty-five million, seven hundred seventy-seven thousand, eight hundred seventy-eight".