55000778 has 16 divisors (see below), whose sum is σ = 94488000. Its totient is φ = 23521536.

The previous prime is 55000753. The next prime is 55000783. The reversal of 55000778 is 87700055.

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3050 + ... + 10922.

It is an arithmetic number, because the mean of its divisors is an integer number (5905500).

Almost surely, 2^55000778 is an apocalyptic number.

55000778 is a deficient number, since it is larger than the sum of its proper divisors (39487222).

55000778 is a wasteful number, since it uses less digits than its factorization.

55000778 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8381.

The product of its (nonzero) digits is 9800, while the sum is 32.

The square root of 55000778 is about 7416.2509396595. The cubic root of 55000778 is about 380.2970392174.

The spelling of 55000778 in words is "fifty-five million, seven hundred seventy-eight", and thus it is an aban number.