1206720667 has 4 divisors (see below), whose sum is σ = 1206800280. Its totient is φ = 1206641056.

The previous prime is 1206720661. The next prime is 1206720689. The reversal of 1206720667 is 7660276021.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 7660276021 = 29 ⋅264147449.

It is a cyclic number.

It is not a de Polignac number, because 1206720667 - 2¹¹ = 1206718619 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1206720661) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 9253 + ... + 49990.

It is an arithmetic number, because the mean of its divisors is an integer number (301700070).

Almost surely, 2^1206720667 is an apocalyptic number.

1206720667 is a deficient number, since it is larger than the sum of its proper divisors (79613).

1206720667 is an equidigital number, since it uses as much as digits as its factorization.

1206720667 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 79612.

The product of its (nonzero) digits is 42336, while the sum is 37.

The square root of 1206720667 is about 34737.8851831829. The cubic root of 1206720667 is about 1064.6387033693.

Adding to 1206720667 its reverse (7660276021), we get a palindrome (8866996688).

The spelling of 1206720667 in words is "one billion, two hundred six million, seven hundred twenty thousand, six hundred sixty-seven".