1275630720 has 512 divisors, whose sum is σ = 5140800000. Its totient is φ = 267337728.

The previous prime is 1275630679. The next prime is 1275630737. The reversal of 1275630720 is 270365721.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 8561206 + ... + 8561354.

It is an arithmetic number, because the mean of its divisors is an integer number (10040625).

Almost surely, 2^1275630720 is an apocalyptic number.

1275630720 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 1275630720, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2570400000).

1275630720 is an abundant number, since it is smaller than the sum of its proper divisors (3865169280).

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

1275630720 is a wasteful number, since it uses less digits than its factorization.

1275630720 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 205 (or 179 counting only the distinct ones).

The product of its (nonzero) digits is 17640, while the sum is 33.

The square root of 1275630720 is about 35715.9728972906. The cubic root of 1275630720 is about 1084.5302163240.

The spelling of 1275630720 in words is "one billion, two hundred seventy-five million, six hundred thirty thousand, seven hundred twenty".