55906778 has 32 divisors (see below), whose sum is σ = 96033600. Its totient is φ = 24240384.

The previous prime is 55906729. The next prime is 55906789. The reversal of 55906778 is 87760955.

It is a happy number.

55906778 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a Smith number, since the sum of its digits (47) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax 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 15 ways as a sum of consecutive naturals, for example, 22733 + ... + 25071.

It is an arithmetic number, because the mean of its divisors is an integer number (3001050).

Almost surely, 2^55906778 is an apocalyptic number.

55906778 is a deficient number, since it is larger than the sum of its proper divisors (40126822).

55906778 is a wasteful number, since it uses less digits than its factorization.

55906778 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2414.

The product of its (nonzero) digits is 529200, while the sum is 47.

The square root of 55906778 is about 7477.0835223368. The cubic root of 55906778 is about 382.3738242749.

The spelling of 55906778 in words is "fifty-five million, nine hundred six thousand, seven hundred seventy-eight".