1272662721 has 48 divisors (see below), whose sum is σ = 2144683008. Its totient is φ = 718656000.

The previous prime is 1272662719. The next prime is 1272662771.

It is a happy number.

1272662721 is a `hidden beast` number, since 1 + 2 + 7 + 2 + 6 + 627 + 21 = 666.

1272662721 is nontrivially palindromic in base 10.

1272662721 is digitally balanced in base 4, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 1272662721 - 2¹ = 1272662719 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1272662711) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 166240 + ... + 173726.

It is an arithmetic number, because the mean of its divisors is an integer number (44680896).

Almost surely, 2^1272662721 is an apocalyptic number.

1272662721 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

1272662721 is a deficient number, since it is larger than the sum of its proper divisors (872020287).

1272662721 is a wasteful number, since it uses less digits than its factorization.

1272662721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7622 (or 7619 counting only the distinct ones).

The product of its digits is 28224, while the sum is 36.

The square root of 1272662721 is about 35674.3986774830. The cubic root of 1272662721 is about 1083.6884407669.

The spelling of 1272662721 in words is "one billion, two hundred seventy-two million, six hundred sixty-two thousand, seven hundred twenty-one".