55778405 has 8 divisors (see below), whose sum is σ = 66976632. Its totient is φ = 44594368.

The previous prime is 55778363. The next prime is 55778413. The reversal of 55778405 is 50487755.

55778405 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 4 ways, for example, as 37249 + 55741156 = 193^2 + 7466^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 55778405 - 2⁶ = 55778341 is a prime.

It is a super-2 number, since 2×55778405² = 6222460928688050, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 9419 + ... + 14151.

It is an arithmetic number, because the mean of its divisors is an integer number (8372079).

Almost surely, 2^55778405 is an apocalyptic number.

It is an amenable number.

55778405 is a deficient number, since it is larger than the sum of its proper divisors (11198227).

55778405 is a wasteful number, since it uses less digits than its factorization.

55778405 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7095.

The product of its (nonzero) digits is 196000, while the sum is 41.

The square root of 55778405 is about 7468.4941587980. The cubic root of 55778405 is about 382.0809313828.

The spelling of 55778405 in words is "fifty-five million, seven hundred seventy-eight thousand, four hundred five".