55855878 has 32 divisors (see below), whose sum is σ = 120591072. Its totient is φ = 17145600.

The previous prime is 55855873. The next prime is 55855907. The reversal of 55855878 is 87855855.

It is a self number, because there is not a number n which added to its sum of digits gives 55855878.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (55855871) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 58888 + ... + 59828.

It is an arithmetic number, because the mean of its divisors is an integer number (3768471).

Almost surely, 2^55855878 is an apocalyptic number.

55855878 is an abundant number, since it is smaller than the sum of its proper divisors (64735194).

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

55855878 is a wasteful number, since it uses less digits than its factorization.

55855878 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1720.

The product of its digits is 2240000, while the sum is 51.

The square root of 55855878 is about 7473.6790137121. The cubic root of 55855878 is about 382.2577457006.

The spelling of 55855878 in words is "fifty-five million, eight hundred fifty-five thousand, eight hundred seventy-eight".