1521180720 has 60 divisors (see below), whose sum is σ = 5108634336. Its totient is φ = 405648000.

The previous prime is 1521180707. The next prime is 1521180721. The reversal of 1521180720 is 270811251.

It is a tau number, because it is divible by the number of its divisors (60).

It is not an unprimeable number, because it can be changed into a prime (1521180721) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1055656 + ... + 1057095.

Almost surely, 2^1521180720 is an apocalyptic number.

1521180720 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1521180720 is an abundant number, since it is smaller than the sum of its proper divisors (3587453616).

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

1521180720 is a wasteful number, since it uses less digits than its factorization.

1521180720 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2112770 (or 2112761 counting only the distinct ones).

The product of its (nonzero) digits is 1120, while the sum is 27.

The square root of 1521180720 is about 39002.3168542588. The cubic root of 1521180720 is about 1150.0770509181.

Adding to 1521180720 its reverse (270811251), we get a palindrome (1791991971).

The spelling of 1521180720 in words is "one billion, five hundred twenty-one million, one hundred eighty thousand, seven hundred twenty".