5278778 has 4 divisors (see below), whose sum is σ = 7918170. Its totient is φ = 2639388.

The previous prime is 5278771. The next prime is 5278787. The reversal of 5278778 is 8778725.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 5121169 + 157609 = 2263^2 + 397^2 .

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (5278771) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1319693 + ... + 1319696.

Almost surely, 2^5278778 is an apocalyptic number.

5278778 is a deficient number, since it is larger than the sum of its proper divisors (2639392).

5278778 is a wasteful number, since it uses less digits than its factorization.

5278778 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2639391.

The product of its digits is 219520, while the sum is 44.

The square root of 5278778 is about 2297.5591396088. The cubic root of 5278778 is about 174.1183191378.

The spelling of 5278778 in words is "five million, two hundred seventy-eight thousand, seven hundred seventy-eight".