1275720480 has 144 divisors (see below), whose sum is σ = 4382973504. Its totient is φ = 337881600.

The previous prime is 1275720473. The next prime is 1275720491. The reversal of 1275720480 is 840275721.

1275720480 is a `hidden beast` number, since 1 + 2 + 7 + 572 + 0 + 4 + 80 = 666.

It is a tau number, because it is divible by the number of its divisors (144).

It is a Harshad number since it is a multiple of its sum of digits (36).

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 214507 + ... + 220373.

It is an arithmetic number, because the mean of its divisors is an integer number (30437316).

Almost surely, 2^1275720480 is an apocalyptic number.

1275720480 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 1275720480, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2191486752).

1275720480 is an abundant number, since it is smaller than the sum of its proper divisors (3107253024).

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

1275720480 is a wasteful number, since it uses less digits than its factorization.

1275720480 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6039 (or 6028 counting only the distinct ones).

The product of its (nonzero) digits is 31360, while the sum is 36.

The square root of 1275720480 is about 35717.2294558243. The cubic root of 1275720480 is about 1084.5556534528. Note that the first 3 decimals are identical.

The spelling of 1275720480 in words is "one billion, two hundred seventy-five million, seven hundred twenty thousand, four hundred eighty".