1290520720 has 20 divisors (see below), whose sum is σ = 3000460860. Its totient is φ = 516208256.

The previous prime is 1290520709. The next prime is 1290520789. The reversal of 1290520720 is 270250921.

It can be written as a sum of positive squares in 2 ways, for example, as 170145936 + 1120374784 = 13044^2 + 33472^2 .

It is a tau number, because it is divible by the number of its divisors (20).

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8065675 + ... + 8065834.

It is an arithmetic number, because the mean of its divisors is an integer number (150023043).

Almost surely, 2^1290520720 is an apocalyptic number.

1290520720 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1290520720 is an abundant number, since it is smaller than the sum of its proper divisors (1709940140).

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

1290520720 is a wasteful number, since it uses less digits than its factorization.

1290520720 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16131522 (or 16131516 counting only the distinct ones).

The product of its (nonzero) digits is 2520, while the sum is 28.

The square root of 1290520720 is about 35923.8182825824. The cubic root of 1290520720 is about 1088.7336863961.

The spelling of 1290520720 in words is "one billion, two hundred ninety million, five hundred twenty thousand, seven hundred twenty".