54778678 has 4 divisors (see below), whose sum is σ = 82168020. Its totient is φ = 27389338.

The previous prime is 54778673. The next prime is 54778681. The reversal of 54778678 is 87687745.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 87687745 = 5 ⋅17537549.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (54778673) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 13694668 + ... + 13694671.

It is an arithmetic number, because the mean of its divisors is an integer number (20542005).

Almost surely, 2^54778678 is an apocalyptic number.

54778678 is a deficient number, since it is larger than the sum of its proper divisors (27389342).

54778678 is a wasteful number, since it uses less digits than its factorization.

54778678 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27389341.

The product of its digits is 2634240, while the sum is 52.

The square root of 54778678 is about 7401.2619194297. The cubic root of 54778678 is about 379.7844530126.

The spelling of 54778678 in words is "fifty-four million, seven hundred seventy-eight thousand, six hundred seventy-eight".