1287789264 has 30 divisors (see below), whose sum is σ = 3604021746. Its totient is φ = 429263040.

The previous prime is 1287789257. The next prime is 1287789299. The reversal of 1287789264 is 4629877821.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 655769664 + 632019600 = 25608^2 + 25140^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 1287789264.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 4471347 + ... + 4471634.

Almost surely, 2^1287789264 is an apocalyptic number.

It is an amenable number.

1287789264 is an abundant number, since it is smaller than the sum of its proper divisors (2316232482).

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

1287789264 is a wasteful number, since it uses less digits than its factorization.

1287789264 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8942995 (or 8942986 counting only the distinct ones).

The product of its digits is 2709504, while the sum is 54.

The square root of 1287789264 is about 35885.7808052159. The cubic root of 1287789264 is about 1087.9650228447.

The spelling of 1287789264 in words is "one billion, two hundred eighty-seven million, seven hundred eighty-nine thousand, two hundred sixty-four".