263406478 has 16 divisors (see below), whose sum is σ = 419784480. Its totient is φ = 123723936.

The previous prime is 263406469. The next prime is 263406497. The reversal of 263406478 is 874604362.

It is a happy number.

263406478 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a self number, because there is not a number n which added to its sum of digits gives 263406478.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 59226 + ... + 63517.

It is an arithmetic number, because the mean of its divisors is an integer number (26236530).

Almost surely, 2^263406478 is an apocalyptic number.

263406478 is a deficient number, since it is larger than the sum of its proper divisors (156378002).

263406478 is a wasteful number, since it uses less digits than its factorization.

263406478 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 122811.

The product of its (nonzero) digits is 193536, while the sum is 40.

The square root of 263406478 is about 16229.8021552944. The cubic root of 263406478 is about 641.0257623040.

The spelling of 263406478 in words is "two hundred sixty-three million, four hundred six thousand, four hundred seventy-eight".