478778 has 4 divisors (see below), whose sum is σ = 718170. Its totient is φ = 239388.

The previous prime is 478769. The next prime is 478787. The reversal of 478778 is 877874.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 877874 = 2 ⋅438937.

It is an interprime number because it is at equal distance from previous prime (478769) and next prime (478787).

It can be written as a sum of positive squares in only one way, i.e., 458329 + 20449 = 677^2 + 143^2 .

It is a Curzon number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 119693 + ... + 119696.

2⁴⁷⁸⁷⁷⁸ is an apocalyptic number.

478778 is a deficient number, since it is larger than the sum of its proper divisors (239392).

478778 is a wasteful number, since it uses less digits than its factorization.

478778 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 239391.

The product of its digits is 87808, while the sum is 41.

The square root of 478778 is about 691.9378584815. The cubic root of 478778 is about 78.2308523548.

The spelling of 478778 in words is "four hundred seventy-eight thousand, seven hundred seventy-eight".