478894778 has 4 divisors (see below), whose sum is σ = 718342170. Its totient is φ = 239447388.

The previous prime is 478894771. The next prime is 478894781. The reversal of 478894778 is 877498874.

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., 430272049 + 48622729 = 20743^2 + 6973^2 .

It is a super-3 number, since 3×478894778³ (a number of 27 digits) contains 333 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 478894778.

It is not an unprimeable number, because it can be changed into a prime (478894771) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 119723693 + ... + 119723696.

Almost surely, 2^478894778 is an apocalyptic number.

478894778 is a deficient number, since it is larger than the sum of its proper divisors (239447392).

478894778 is a wasteful number, since it uses less digits than its factorization.

478894778 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 239447391.

The product of its digits is 25288704, while the sum is 62.

The square root of 478894778 is about 21883.6646382639. The cubic root of 478894778 is about 782.3721222640.

The spelling of 478894778 in words is "four hundred seventy-eight million, eight hundred ninety-four thousand, seven hundred seventy-eight".