55778900 has 18 divisors (see below), whose sum is σ = 121040430. Its totient is φ = 22311520.

The previous prime is 55778867. The next prime is 55778909. The reversal of 55778900 is 987755.

It is a happy number.

55778900 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 3 ways, for example, as 14227984 + 41550916 = 3772^2 + 6446^2 .

It is a super-2 number, since 2×55778900² = 6222571370420000, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (55778909) 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 5 ways as a sum of consecutive naturals, for example, 278795 + ... + 278994.

Almost surely, 2^55778900 is an apocalyptic number.

55778900 is a gapful number since it is divisible by the number (50) formed by its first and last digit.

It is an amenable number.

55778900 is an abundant number, since it is smaller than the sum of its proper divisors (65261530).

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

55778900 is a wasteful number, since it uses less digits than its factorization.

55778900 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 557803 (or 557796 counting only the distinct ones).

The product of its (nonzero) digits is 88200, while the sum is 41.

The square root of 55778900 is about 7468.5272979350. The cubic root of 55778900 is about 382.0820616260.

The spelling of 55778900 in words is "fifty-five million, seven hundred seventy-eight thousand, nine hundred".