1288699904 has 42 divisors (see below), whose sum is σ = 2579495730. Its totient is φ = 643825664.

The previous prime is 1288699837. The next prime is 1288699927. The reversal of 1288699904 is 4099968821.

It can be written as a sum of positive squares in only one way, i.e., 1284505600 + 4194304 = 35840^2 + 2048^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 1288699904.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1047962 + ... + 1049190.

It is an arithmetic number, because the mean of its divisors is an integer number (61416565).

Almost surely, 2^1288699904 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1288699904, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1289747865).

1288699904 is an abundant number, since it is smaller than the sum of its proper divisors (1290795826).

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

1288699904 is an frugal number, since it uses more digits than its factorization.

1288699904 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1269 (or 1231 counting only the distinct ones).

The product of its (nonzero) digits is 2239488, while the sum is 56.

The square root of 1288699904 is about 35898.4665967782. The cubic root of 1288699904 is about 1088.2214082275.

The spelling of 1288699904 in words is "one billion, two hundred eighty-eight million, six hundred ninety-nine thousand, nine hundred four".