6406250778 has 24 divisors (see below), whose sum is σ = 14055912000. Its totient is φ = 2108385864.

The previous prime is 6406250759. The next prime is 6406250783. The reversal of 6406250778 is 8770526046.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 2251128 + ... + 2253971.

It is an arithmetic number, because the mean of its divisors is an integer number (585663000).

Almost surely, 2^6406250778 is an apocalyptic number.

6406250778 is an abundant number, since it is smaller than the sum of its proper divisors (7649661222).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

6406250778 is a wasteful number, since it uses less digits than its factorization.

6406250778 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4505186 (or 4505183 counting only the distinct ones).

The product of its (nonzero) digits is 564480, while the sum is 45.

The square root of 6406250778 is about 80039.0578280379. The cubic root of 6406250778 is about 1857.2397855451.

The spelling of 6406250778 in words is "six billion, four hundred six million, two hundred fifty thousand, seven hundred seventy-eight".