478155778 has 4 divisors (see below), whose sum is σ = 717233670. Its totient is φ = 239077888.

The previous prime is 478155757. The next prime is 478155791. The reversal of 478155778 is 877551874.

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., 452115169 + 26040609 = 21263^2 + 5103^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 119538943 + ... + 119538946.

Almost surely, 2^478155778 is an apocalyptic number.

478155778 is a deficient number, since it is larger than the sum of its proper divisors (239077892).

478155778 is a wasteful number, since it uses less digits than its factorization.

478155778 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 239077891.

The product of its digits is 2195200, while the sum is 52.

The square root of 478155778 is about 21866.7733788047. The cubic root of 478155778 is about 781.9694794288.

The spelling of 478155778 in words is "four hundred seventy-eight million, one hundred fifty-five thousand, seven hundred seventy-eight".