55877778 has 48 divisors (see below), whose sum is σ = 132736032. Its totient is φ = 16848000.

The previous prime is 55877753. The next prime is 55877791. The reversal of 55877778 is 87777855.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 47133 + ... + 48303.

It is an arithmetic number, because the mean of its divisors is an integer number (2765334).

Almost surely, 2^55877778 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 55877778, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (66368016).

55877778 is an abundant number, since it is smaller than the sum of its proper divisors (76858254).

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

55877778 is a wasteful number, since it uses less digits than its factorization.

55877778 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1431 (or 1428 counting only the distinct ones).

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

The square root of 55877778 is about 7475.1440119907. The cubic root of 55877778 is about 382.3076977741.

It can be divided in two parts, 558777 and 78, that added together give a palindrome (558855).

The spelling of 55877778 in words is "fifty-five million, eight hundred seventy-seven thousand, seven hundred seventy-eight".