1275563520 has 480 divisors, whose sum is σ = 5515361280. Its totient is φ = 264683520.

The previous prime is 1275563501. The next prime is 1275563551. The reversal of 1275563520 is 253655721.

1275563520 is a `hidden beast` number, since 1 + 2 + 75 + 5 + 63 + 520 = 666.

It is a tau number, because it is divible by the number of its divisors (480).

It is a hoax number, since the sum of its digits (36) coincides with the sum of the digits of its distinct prime factors.

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

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 1773721 + ... + 1774439.

It is an arithmetic number, because the mean of its divisors is an integer number (11490336).

Almost surely, 2^1275563520 is an apocalyptic number.

1275563520 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 1275563520, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2757680640).

1275563520 is an abundant number, since it is smaller than the sum of its proper divisors (4239797760).

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

1275563520 is a wasteful number, since it uses less digits than its factorization.

1275563520 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 766 (or 747 counting only the distinct ones).

The product of its (nonzero) digits is 63000, while the sum is 36.

The square root of 1275563520 is about 35715.0321293430. The cubic root of 1275563520 is about 1084.5111717031.

The spelling of 1275563520 in words is "one billion, two hundred seventy-five million, five hundred sixty-three thousand, five hundred twenty".