1280257152 has 64 divisors (see below), whose sum is σ = 3406147200. Its totient is φ = 426066944.

The previous prime is 1280257151. The next prime is 1280257157. The reversal of 1280257152 is 2517520821.

It is a tau number, because it is divible by the number of its divisors (64).

It is a super-2 number, since 2×1280257152² = 3278116750494302208, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (1280257151) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 273778 + ... + 278414.

It is an arithmetic number, because the mean of its divisors is an integer number (53221050).

Almost surely, 2^1280257152 is an apocalyptic number.

1280257152 is a gapful number since it is divisible by the number (12) 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 1280257152, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1703073600).

1280257152 is an abundant number, since it is smaller than the sum of its proper divisors (2125890048).

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

1280257152 is an equidigital number, since it uses as much as digits as its factorization.

1280257152 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5373 (or 5361 counting only the distinct ones).

The product of its (nonzero) digits is 11200, while the sum is 33.

The square root of 1280257152 is about 35780.6812679692. The cubic root of 1280257152 is about 1085.8397519692.

Adding to 1280257152 its reverse (2517520821), we get a palindrome (3797777973).

The spelling of 1280257152 in words is "one billion, two hundred eighty million, two hundred fifty-seven thousand, one hundred fifty-two".