1278660513 has 32 divisors (see below), whose sum is σ = 1905361920. Its totient is φ = 757673280.

The previous prime is 1278660479. The next prime is 1278660517. The reversal of 1278660513 is 3150668721.

It is not a de Polignac number, because 1278660513 - 2¹⁸ = 1278398369 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (39).

It is not an unprimeable number, because it can be changed into a prime (1278660517) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 113698 + ... + 124436.

It is an arithmetic number, because the mean of its divisors is an integer number (59542560).

Almost surely, 2^1278660513 is an apocalyptic number.

1278660513 is a gapful number since it is divisible by the number (13) formed by its first and last digit.

It is an amenable number.

1278660513 is a deficient number, since it is larger than the sum of its proper divisors (626701407).

1278660513 is a wasteful number, since it uses less digits than its factorization.

1278660513 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10869.

The product of its (nonzero) digits is 60480, while the sum is 39.

The square root of 1278660513 is about 35758.3628400406. The cubic root of 1278660513 is about 1085.3881720391.

The spelling of 1278660513 in words is "one billion, two hundred seventy-eight million, six hundred sixty thousand, five hundred thirteen".