1288771420 has 48 divisors (see below), whose sum is σ = 2900455488. Its totient is φ = 479761920.

The previous prime is 1288771417. The next prime is 1288771423. The reversal of 1288771420 is 241778821.

1288771420 is digitally balanced in base 6, because in such base it contains all the possibile digits an equal number of times.

It is an interprime number because it is at equal distance from previous prime (1288771417) and next prime (1288771423).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1288771423) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 20841 + ... + 54880.

It is an arithmetic number, because the mean of its divisors is an integer number (60426156).

Almost surely, 2^1288771420 is an apocalyptic number.

1288771420 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1288771420 is an abundant number, since it is smaller than the sum of its proper divisors (1611684068).

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

1288771420 is a wasteful number, since it uses less digits than its factorization.

1288771420 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 75790 (or 75788 counting only the distinct ones).

The product of its (nonzero) digits is 50176, while the sum is 40.

The square root of 1288771420 is about 35899.4626700735. The cubic root of 1288771420 is about 1088.2415380246.

The spelling of 1288771420 in words is "one billion, two hundred eighty-eight million, seven hundred seventy-one thousand, four hundred twenty".