1272647870 has 32 divisors (see below), whose sum is σ = 2468642400. Its totient is φ = 469584000.

The previous prime is 1272647821. The next prime is 1272647899. The reversal of 1272647870 is 787462721.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 290456 + ... + 294804.

It is an arithmetic number, because the mean of its divisors is an integer number (77145075).

Almost surely, 2^1272647870 is an apocalyptic number.

1272647870 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1272647870 is a deficient number, since it is larger than the sum of its proper divisors (1195994530).

1272647870 is a wasteful number, since it uses less digits than its factorization.

1272647870 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6620.

The product of its (nonzero) digits is 263424, while the sum is 44.

The square root of 1272647870 is about 35674.1905304101. The cubic root of 1272647870 is about 1083.6842254789.

The spelling of 1272647870 in words is "one billion, two hundred seventy-two million, six hundred forty-seven thousand, eight hundred seventy".