1516120720 has 80 divisors (see below), whose sum is σ = 3653480448. Its totient is φ = 584501760.

The previous prime is 1516120709. The next prime is 1516120733. The reversal of 1516120720 is 270216151.

It is a tau number, because it is divible by the number of its divisors (80).

It is a super-2 number, since 2×1516120720² = 4597244075226636800, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 685857 + ... + 688063.

Almost surely, 2^1516120720 is an apocalyptic number.

1516120720 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 1516120720, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1826740224).

1516120720 is an abundant number, since it is smaller than the sum of its proper divisors (2137359728).

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

1516120720 is a wasteful number, since it uses less digits than its factorization.

1516120720 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2528 (or 2522 counting only the distinct ones).

The product of its (nonzero) digits is 840, while the sum is 25.

The square root of 1516120720 is about 38937.3948794729. The cubic root of 1516120720 is about 1148.8004429472.

Adding to 1516120720 its reverse (270216151), we get a palindrome (1786336871).

The spelling of 1516120720 in words is "one billion, five hundred sixteen million, one hundred twenty thousand, seven hundred twenty".