1288016640 has 432 divisors, whose sum is σ = 4781046816. Its totient is φ = 331776000.

The previous prime is 1288016621. The next prime is 1288016641. The reversal of 1288016640 is 466108821.

1288016640 is a `hidden beast` number, since 1 + 2 + 8 + 8 + 0 + 1 + 6 + 640 = 666.

It is a tau number, because it is divible by the number of its divisors (432).

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a junction number, because it is equal to n+sod(n) for n = 1288016595 and 1288016604.

It is not an unprimeable number, because it can be changed into a prime (1288016641) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 12752590 + ... + 12752690.

It is an arithmetic number, because the mean of its divisors is an integer number (11067238).

Almost surely, 2^1288016640 is an apocalyptic number.

1288016640 is a gapful number since it is divisible by the number (10) 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 1288016640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2390523408).

1288016640 is an abundant number, since it is smaller than the sum of its proper divisors (3493030176).

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

1288016640 is an equidigital number, since it uses as much as digits as its factorization.

1288016640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 178 (or 152 counting only the distinct ones).

The product of its (nonzero) digits is 18432, while the sum is 36.

The square root of 1288016640 is about 35888.9487168404. The cubic root of 1288016640 is about 1088.0290505507.

The spelling of 1288016640 in words is "one billion, two hundred eighty-eight million, sixteen thousand, six hundred forty".