55278775 has 12 divisors (see below), whose sum is σ = 71526672. Its totient is φ = 42299840.

The previous prime is 55278731. The next prime is 55278793. The reversal of 55278775 is 57787255.

It is a de Polignac number, because none of the positive numbers 2^k-55278775 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 47494 + ... + 48643.

It is an arithmetic number, because the mean of its divisors is an integer number (5960556).

Almost surely, 2^55278775 is an apocalyptic number.

55278775 is a deficient number, since it is larger than the sum of its proper divisors (16247897).

55278775 is a wasteful number, since it uses less digits than its factorization.

55278775 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 96170 (or 96165 counting only the distinct ones).

The product of its digits is 686000, while the sum is 46.

The square root of 55278775 is about 7434.9697376654. The cubic root of 55278775 is about 380.9366896501.

The spelling of 55278775 in words is "fifty-five million, two hundred seventy-eight thousand, seven hundred seventy-five".