1275480640 has 224 divisors, whose sum is σ = 3815608320. Its totient is φ = 395974656.

The previous prime is 1275480631. The next prime is 1275480643. The reversal of 1275480640 is 460845721.

It is a tau number, because it is divible by the number of its divisors (224).

It is a self number, because there is not a number n which added to its sum of digits gives 1275480640.

It is not an unprimeable number, because it can be changed into a prime (1275480643) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 978229 + ... + 979531.

Almost surely, 2^1275480640 is an apocalyptic number.

1275480640 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 1275480640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1907804160).

1275480640 is an abundant number, since it is smaller than the sum of its proper divisors (2540127680).

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

1275480640 is a wasteful number, since it uses less digits than its factorization.

1275480640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1369 (or 1359 counting only the distinct ones).

The product of its (nonzero) digits is 53760, while the sum is 37.

The square root of 1275480640 is about 35713.8718147445. The cubic root of 1275480640 is about 1084.4876824161.

The spelling of 1275480640 in words is "one billion, two hundred seventy-five million, four hundred eighty thousand, six hundred forty".