55278065 has 8 divisors (see below), whose sum is σ = 66405480. Its totient is φ = 44174592.

The previous prime is 55278061. The next prime is 55278077. The reversal of 55278065 is 56087255.

It can be written as a sum of positive squares in 4 ways, for example, as 4355569 + 50922496 = 2087^2 + 7136^2 .

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

It is a cyclic number.

It is not a de Polignac number, because 55278065 - 2² = 55278061 is a prime.

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 7 ways as a sum of consecutive naturals, for example, 434 + ... + 10523.

It is an arithmetic number, because the mean of its divisors is an integer number (8300685).

Almost surely, 2^55278065 is an apocalyptic number.

It is an amenable number.

55278065 is a deficient number, since it is larger than the sum of its proper divisors (11127415).

55278065 is a wasteful number, since it uses less digits than its factorization.

55278065 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11971.

The product of its (nonzero) digits is 84000, while the sum is 38.

The square root of 55278065 is about 7434.9219901758. The cubic root of 55278065 is about 380.9350587275.

The spelling of 55278065 in words is "fifty-five million, two hundred seventy-eight thousand, sixty-five".