1286220720 has 160 divisors (see below), whose sum is σ = 4178304000. Its totient is φ = 326689792.

The previous prime is 1286220707. The next prime is 1286220781. The reversal of 1286220720 is 270226821.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 2146981 + ... + 2147579.

It is an arithmetic number, because the mean of its divisors is an integer number (26114400).

Almost surely, 2^1286220720 is an apocalyptic number.

1286220720 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 1286220720, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2089152000).

1286220720 is an abundant number, since it is smaller than the sum of its proper divisors (2892083280).

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

1286220720 is a wasteful number, since it uses less digits than its factorization.

1286220720 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1027 (or 1021 counting only the distinct ones).

The product of its (nonzero) digits is 5376, while the sum is 30.

The square root of 1286220720 is about 35863.9194734764. The cubic root of 1286220720 is about 1087.5231248881.

The spelling of 1286220720 in words is "one billion, two hundred eighty-six million, two hundred twenty thousand, seven hundred twenty".