1272708761 has 8 divisors (see below), whose sum is σ = 1318761480. Its totient is φ = 1226800512.

The previous prime is 1272708733. The next prime is 1272708763. The reversal of 1272708761 is 1678072721.

It can be written as a sum of positive squares in 4 ways, for example, as 3136 + 1272705625 = 56^2 + 35675^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1272708761 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1272708763) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 18020 + ... + 53573.

It is an arithmetic number, because the mean of its divisors is an integer number (164845185).

Almost surely, 2^1272708761 is an apocalyptic number.

It is an amenable number.

1272708761 is a deficient number, since it is larger than the sum of its proper divisors (46052719).

1272708761 is an equidigital number, since it uses as much as digits as its factorization.

1272708761 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 72235.

The product of its (nonzero) digits is 65856, while the sum is 41.

The square root of 1272708761 is about 35675.0439523205. The cubic root of 1272708761 is about 1083.7015084905.

The spelling of 1272708761 in words is "one billion, two hundred seventy-two million, seven hundred eight thousand, seven hundred sixty-one".