1278472615 has 16 divisors (see below), whose sum is σ = 1790641152. Its totient is φ = 858013344.

The previous prime is 1278472567. The next prime is 1278472639. The reversal of 1278472615 is 5162748721.

It is a cyclic number.

It is not a de Polignac number, because 1278472615 - 2¹⁷ = 1278341543 is a prime.

It is a Duffinian 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, 386949 + ... + 390238.

It is an arithmetic number, because the mean of its divisors is an integer number (111915072).

Almost surely, 2^1278472615 is an apocalyptic number.

1278472615 is a deficient number, since it is larger than the sum of its proper divisors (512168537).

1278472615 is an equidigital number, since it uses as much as digits as its factorization.

1278472615 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 777246.

The product of its digits is 188160, while the sum is 43.

The square root of 1278472615 is about 35755.7354140563. The cubic root of 1278472615 is about 1085.3350038329.

The spelling of 1278472615 in words is "one billion, two hundred seventy-eight million, four hundred seventy-two thousand, six hundred fifteen".