1278762879 has 8 divisors (see below), whose sum is σ = 1708956592. Its totient is φ = 850538880.

The previous prime is 1278762869. The next prime is 1278762893. The reversal of 1278762879 is 9782678721.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 1278762879 - 2⁵ = 1278762847 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1278762869) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 490912 + ... + 493509.

It is an arithmetic number, because the mean of its divisors is an integer number (213619574).

Almost surely, 2^1278762879 is an apocalyptic number.

1278762879 is a deficient number, since it is larger than the sum of its proper divisors (430193713).

1278762879 is an equidigital number, since it uses as much as digits as its factorization.

1278762879 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 984857.

The product of its digits is 4741632, while the sum is 57.

The square root of 1278762879 is about 35759.7941688707. The cubic root of 1278762879 is about 1085.4171356510.

The spelling of 1278762879 in words is "one billion, two hundred seventy-eight million, seven hundred sixty-two thousand, eight hundred seventy-nine".