1287179964 has 96 divisors (see below), whose sum is σ = 3945446400. Its totient is φ = 355078080.

The previous prime is 1287179963. The next prime is 1287179983. The reversal of 1287179964 is 4699717821.

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

It is a self number, because there is not a number n which added to its sum of digits gives 1287179964.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1287179963) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 7432 + ... + 51279.

It is an arithmetic number, because the mean of its divisors is an integer number (41098400).

Almost surely, 2^1287179964 is an apocalyptic number.

1287179964 is a gapful number since it is divisible by the number (14) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1287179964, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1972723200).

1287179964 is an abundant number, since it is smaller than the sum of its proper divisors (2658266436).

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

1287179964 is a wasteful number, since it uses less digits than its factorization.

1287179964 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 58760 (or 58752 counting only the distinct ones).

The product of its digits is 1524096, while the sum is 54.

The square root of 1287179964 is about 35877.2903659125. The cubic root of 1287179964 is about 1087.7934104851.

The spelling of 1287179964 in words is "one billion, two hundred eighty-seven million, one hundred seventy-nine thousand, nine hundred sixty-four".