6922643778 has 42 divisors (see below), whose sum is σ = 15575974659. Its totient is φ = 2306488932.

The previous prime is 6922643713. The next prime is 6922643789. The reversal of 6922643778 is 8773462296.

6922643778 is a `hidden beast` number, since 6 + 9 + 2 + 264 + 377 + 8 = 666.

It can be written as a sum of positive squares in only one way, i.e., 3461321889 + 3461321889 = 58833^2 + 58833^2 .

It is an ABA number since it can be written as A⋅B^A, here for A=2, B=58833.

It is a super-2 number, since 2×6922643778² = 95845993754164226568, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is an unprimeable number.

It is a polite number, since it can be written in 20 ways as a sum of consecutive naturals, for example, 3175893 + ... + 3178071.

Almost surely, 2^6922643778 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 6922643778

6922643778 is an abundant number, since it is smaller than the sum of its proper divisors (8653330881).

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

6922643778 is an frugal number, since it uses more digits than its factorization.

6922643778 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4378 (or 2184 counting only the distinct ones).

The product of its digits is 6096384, while the sum is 54.

The square root of 6922643778 is about 83202.4265150963. The cubic root of 6922643778 is about 1905.8585354594.

The spelling of 6922643778 in words is "six billion, nine hundred twenty-two million, six hundred forty-three thousand, seven hundred seventy-eight".