6722470778 has 4 divisors (see below), whose sum is σ = 10083706170. Its totient is φ = 3361235388.

The previous prime is 6722470721. The next prime is 6722470787. The reversal of 6722470778 is 8770742276.

It is a happy number.

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., 6136685569 + 585785209 = 78337^2 + 24203^2 .

It is a super-2 number, since 2×6722470778² = 90383226722127850568, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1680617693 + ... + 1680617696.

Almost surely, 2^6722470778 is an apocalyptic number.

6722470778 is a deficient number, since it is larger than the sum of its proper divisors (3361235392).

6722470778 is a wasteful number, since it uses less digits than its factorization.

6722470778 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3361235391.

The product of its (nonzero) digits is 1843968, while the sum is 50.

The square root of 6722470778 is about 81990.6749453863. The cubic root of 6722470778 is about 1887.3088410592.

The spelling of 6722470778 in words is "six billion, seven hundred twenty-two million, four hundred seventy thousand, seven hundred seventy-eight".