1601510720 has 28 divisors (see below), whose sum is σ = 3813598164. Its totient is φ = 640604160.

The previous prime is 1601510633. The next prime is 1601510749. The reversal of 1601510720 is 270151061.

It can be written as a sum of positive squares in 2 ways, for example, as 832668736 + 768841984 = 28856^2 + 27728^2 .

It is a congruent number.

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, 2502041 + ... + 2502680.

Almost surely, 2^1601510720 is an apocalyptic number.

1601510720 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1601510720 is an abundant number, since it is smaller than the sum of its proper divisors (2212087444).

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

1601510720 is an equidigital number, since it uses as much as digits as its factorization.

1601510720 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5004738 (or 5004728 counting only the distinct ones).

The product of its (nonzero) digits is 420, while the sum is 23.

The square root of 1601510720 is about 40018.8795445350. The cubic root of 1601510720 is about 1169.9750938278.

Adding to 1601510720 its reverse (270151061), we get a palindrome (1871661781).

The spelling of 1601510720 in words is "one billion, six hundred one million, five hundred ten thousand, seven hundred twenty".