54278809 has 8 divisors (see below), whose sum is σ = 58515912. Its totient is φ = 50050560.

The previous prime is 54278797. The next prime is 54278821. The reversal of 54278809 is 90887245.

It is an interprime number because it is at equal distance from previous prime (54278797) and next prime (54278821).

It can be written as a sum of positive squares in 4 ways, for example, as 30969225 + 23309584 = 5565^2 + 4828^2 .

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 54278809 - 2⁷ = 54278681 is a prime.

It is not an unprimeable number, because it can be changed into a prime (54278849) 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, 16329 + ... + 19369.

It is an arithmetic number, because the mean of its divisors is an integer number (7314489).

Almost surely, 2^54278809 is an apocalyptic number.

It is an amenable number.

54278809 is a deficient number, since it is larger than the sum of its proper divisors (4237103).

54278809 is a wasteful number, since it uses less digits than its factorization.

54278809 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4427.

The product of its (nonzero) digits is 161280, while the sum is 43.

The square root of 54278809 is about 7367.4153541116. The cubic root of 54278809 is about 378.6257121772.

The spelling of 54278809 in words is "fifty-four million, two hundred seventy-eight thousand, eight hundred nine".