1272188078 has 12 divisors (see below), whose sum is σ = 2219838552. Its totient is φ = 545223420.

The previous prime is 1272188059. The next prime is 1272188117. The reversal of 1272188078 is 8708812721.

It is a Smith number, since the sum of its digits (44) coincides with the sum of the digits of its prime factors.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 6490658 + ... + 6490853.

It is an arithmetic number, because the mean of its divisors is an integer number (184986546).

Almost surely, 2^1272188078 is an apocalyptic number.

1272188078 is a deficient number, since it is larger than the sum of its proper divisors (947650474).

1272188078 is a wasteful number, since it uses less digits than its factorization.

1272188078 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12981527 (or 12981520 counting only the distinct ones).

The product of its (nonzero) digits is 100352, while the sum is 44.

The square root of 1272188078 is about 35667.7456254247. The cubic root of 1272188078 is about 1083.5537025046.

The spelling of 1272188078 in words is "one billion, two hundred seventy-two million, one hundred eighty-eight thousand, seventy-eight".