1261678272 has 56 divisors (see below), whose sum is σ = 3383956656. Its totient is φ = 414793728.

The previous prime is 1261678267. The next prime is 1261678277. The reversal of 1261678272 is 2728761621.

It is an interprime number because it is at equal distance from previous prime (1261678267) and next prime (1261678277).

It is a Smith number, since the sum of its digits (42) coincides with the sum of the digits of its prime factors.

It is not an unprimeable number, because it can be changed into a prime (1261678277) 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, 30993 + ... + 59024.

Almost surely, 2^1261678272 is an apocalyptic number.

1261678272 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

1261678272 is an abundant number, since it is smaller than the sum of its proper divisors (2122278384).

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

1261678272 is an equidigital number, since it uses as much as digits as its factorization.

1261678272 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 90105 (or 90095 counting only the distinct ones).

The product of its digits is 112896, while the sum is 42.

The square root of 1261678272 is about 35520.1108106380. The cubic root of 1261678272 is about 1080.5616283269.

The spelling of 1261678272 in words is "one billion, two hundred sixty-one million, six hundred seventy-eight thousand, two hundred seventy-two".