1279987704 has 64 divisors (see below), whose sum is σ = 3600576000. Its totient is φ = 421256160.

The previous prime is 1279987693. The next prime is 1279987711. The reversal of 1279987704 is 4077899721.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 20442 + ... + 54569.

It is an arithmetic number, because the mean of its divisors is an integer number (56259000).

Almost surely, 2^1279987704 is an apocalyptic number.

It is an amenable number.

1279987704 is an abundant number, since it is smaller than the sum of its proper divisors (2320588296).

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

1279987704 is a wasteful number, since it uses less digits than its factorization.

1279987704 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 75105 (or 75095 counting only the distinct ones).

The product of its (nonzero) digits is 1778112, while the sum is 54.

The square root of 1279987704 is about 35776.9157977599. The cubic root of 1279987704 is about 1085.7635699103.

The spelling of 1279987704 in words is "one billion, two hundred seventy-nine million, nine hundred eighty-seven thousand, seven hundred four".