1272816816 has 20 divisors (see below), whose sum is σ = 3288110232. Its totient is φ = 424272256.

The previous prime is 1272816799. The next prime is 1272816863. The reversal of 1272816816 is 6186182721.

1272816816 is digitally balanced in base 4, because in such base it contains all the possibile digits an equal number of times.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 13258461 + ... + 13258556.

Almost surely, 2^1272816816 is an apocalyptic number.

1272816816 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

1272816816 is an abundant number, since it is smaller than the sum of its proper divisors (2015293416).

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

1272816816 is a wasteful number, since it uses less digits than its factorization.

1272816816 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26517028 (or 26517022 counting only the distinct ones).

The product of its digits is 64512, while the sum is 42.

The square root of 1272816816 is about 35676.5583541911. The cubic root of 1272816816 is about 1083.7321769504.

The spelling of 1272816816 in words is "one billion, two hundred seventy-two million, eight hundred sixteen thousand, eight hundred sixteen".