1272078920 has 32 divisors (see below), whose sum is σ = 3271060800. Its totient is φ = 436141248.

The previous prime is 1272078887. The next prime is 1272078931. The reversal of 1272078920 is 298702721.

It is a super-3 number, since 3×1272078920³ (a number of 28 digits) contains 333 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2271290 + ... + 2271849.

It is an arithmetic number, because the mean of its divisors is an integer number (102220650).

Almost surely, 2^1272078920 is an apocalyptic number.

1272078920 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1272078920 is an abundant number, since it is smaller than the sum of its proper divisors (1998981880).

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

1272078920 is a wasteful number, since it uses less digits than its factorization.

1272078920 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4543157 (or 4543153 counting only the distinct ones).

The product of its (nonzero) digits is 28224, while the sum is 38.

The square root of 1272078920 is about 35666.2153865531. The cubic root of 1272078920 is about 1083.5227107720.

The spelling of 1272078920 in words is "one billion, two hundred seventy-two million, seventy-eight thousand, nine hundred twenty".