1245681280 has 32 divisors (see below), whose sum is σ = 2977958340. Its totient is φ = 498272256.

The previous prime is 1245681263. The next prime is 1245681289. The reversal of 1245681280 is 821865421.

It can be written as a sum of positive squares in 2 ways, for example, as 999065664 + 246615616 = 31608^2 + 15704^2 .

It is a tau number, because it is divible by the number of its divisors (32).

It is not an unprimeable number, because it can be changed into a prime (1245681289) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 972549 + ... + 973828.

Almost surely, 2^1245681280 is an apocalyptic number.

1245681280 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1245681280 is an abundant number, since it is smaller than the sum of its proper divisors (1732277060).

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

1245681280 is an equidigital number, since it uses as much as digits as its factorization.

1245681280 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1946396 (or 1946384 counting only the distinct ones).

The product of its (nonzero) digits is 30720, while the sum is 37.

The square root of 1245681280 is about 35294.2102900745. The cubic root of 1245681280 is about 1075.9753268436.

The spelling of 1245681280 in words is "one billion, two hundred forty-five million, six hundred eighty-one thousand, two hundred eighty".