1289025280 has 72 divisors (see below), whose sum is σ = 3116282400. Its totient is φ = 510824448.

The previous prime is 1289025251. The next prime is 1289025293. The reversal of 1289025280 is 825209821.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 134901 + ... + 144139.

It is an arithmetic number, because the mean of its divisors is an integer number (43281700).

Almost surely, 2^1289025280 is an apocalyptic number.

1289025280 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 1289025280, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1558141200).

1289025280 is an abundant number, since it is smaller than the sum of its proper divisors (1827257120).

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

1289025280 is an equidigital number, since it uses as much as digits as its factorization.

1289025280 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9369 (or 9355 counting only the distinct ones).

The product of its (nonzero) digits is 23040, while the sum is 37.

The square root of 1289025280 is about 35902.9982034927. The cubic root of 1289025280 is about 1088.3129866553.

The spelling of 1289025280 in words is "one billion, two hundred eighty-nine million, twenty-five thousand, two hundred eighty".