6408778 has 4 divisors (see below), whose sum is σ = 9613170. Its totient is φ = 3204388.

The previous prime is 6408769. The next prime is 6408791. The reversal of 6408778 is 8778046.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 8778046 = 2 ⋅4389023.

It can be written as a sum of positive squares in only one way, i.e., 3265249 + 3143529 = 1807^2 + 1773^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 6408778.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1602193 + ... + 1602196.

Almost surely, 2^6408778 is an apocalyptic number.

6408778 is a deficient number, since it is larger than the sum of its proper divisors (3204392).

6408778 is a wasteful number, since it uses less digits than its factorization.

6408778 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3204391.

The product of its (nonzero) digits is 75264, while the sum is 40.

The square root of 6408778 is about 2531.5564382411. The cubic root of 6408778 is about 185.7483976224.

The spelling of 6408778 in words is "six million, four hundred eight thousand, seven hundred seventy-eight".