1287279678 has 64 divisors (see below), whose sum is σ = 2880541440. Its totient is φ = 381123072.

The previous prime is 1287279673. The next prime is 1287279701. The reversal of 1287279678 is 8769727821.

1287279678 is digitally balanced in base 4, because in such base it contains all the possibile digits an equal number of times.

It is a Harshad number since it is a multiple of its sum of digits (57).

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1287279671) 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, 566701 + ... + 568967.

It is an arithmetic number, because the mean of its divisors is an integer number (45008460).

Almost surely, 2^1287279678 is an apocalyptic number.

1287279678 is an abundant number, since it is smaller than the sum of its proper divisors (1593261762).

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

1287279678 is a wasteful number, since it uses less digits than its factorization.

1287279678 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2601.

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

The square root of 1287279678 is about 35878.6799924412. The cubic root of 1287279678 is about 1087.8214991322.

The spelling of 1287279678 in words is "one billion, two hundred eighty-seven million, two hundred seventy-nine thousand, six hundred seventy-eight".