1272820616 has 16 divisors (see below), whose sum is σ = 2388053340. Its totient is φ = 636006400.

The previous prime is 1272820613. The next prime is 1272820631. The reversal of 1272820616 is 6160282721.

It can be written as a sum of positive squares in 2 ways, for example, as 1271207716 + 1612900 = 35654^2 + 1270^2 .

It is not an unprimeable number, because it can be changed into a prime (1272820613) 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, 36881 + ... + 62496.

Almost surely, 2^1272820616 is an apocalyptic number.

It is an amenable number.

1272820616 is a deficient number, since it is larger than the sum of its proper divisors (1115232724).

1272820616 is a wasteful number, since it uses less digits than its factorization.

1272820616 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 100984 (or 100980 counting only the distinct ones).

The product of its (nonzero) digits is 16128, while the sum is 35.

The square root of 1272820616 is about 35676.6116104094. The cubic root of 1272820616 is about 1083.7332554450.

The spelling of 1272820616 in words is "one billion, two hundred seventy-two million, eight hundred twenty thousand, six hundred sixteen".