55278066 has 8 divisors (see below), whose sum is σ = 110556144. Its totient is φ = 18426020.

The previous prime is 55278061. The next prime is 55278077. The reversal of 55278066 is 66087255.

It is a happy number.

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

55278066 is an admirable number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (55278061) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4606500 + ... + 4606511.

It is an arithmetic number, because the mean of its divisors is an integer number (13819518).

Almost surely, 2^55278066 is an apocalyptic number.

55278066 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

55278066 is a wasteful number, since it uses less digits than its factorization.

55278066 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9213016.

The product of its (nonzero) digits is 100800, while the sum is 39.

The square root of 55278066 is about 7434.9220574260. The cubic root of 55278066 is about 380.9350610246.

The spelling of 55278066 in words is "fifty-five million, two hundred seventy-eight thousand, sixty-six".