1013800720 has 20 divisors (see below), whose sum is σ = 2357086860. Its totient is φ = 405520256.

The previous prime is 1013800681. The next prime is 1013800751. The reversal of 1013800720 is 270083101.

It can be written as a sum of positive squares in 2 ways, for example, as 500506384 + 513294336 = 22372^2 + 22656^2 .

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

It is a junction number, because it is equal to n+sod(n) for n = 1013800691 and 1013800700.

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, 6336175 + ... + 6336334.

It is an arithmetic number, because the mean of its divisors is an integer number (117854343).

Almost surely, 2^1013800720 is an apocalyptic number.

1013800720 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1013800720 is an abundant number, since it is smaller than the sum of its proper divisors (1343286140).

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

1013800720 is a wasteful number, since it uses less digits than its factorization.

1013800720 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12672522 (or 12672516 counting only the distinct ones).

The product of its (nonzero) digits is 336, while the sum is 22.

The square root of 1013800720 is about 31840.2374363006. The cubic root of 1013800720 is about 1004.5792385662.

Adding to 1013800720 its reverse (270083101), we get a palindrome (1283883821).

The spelling of 1013800720 in words is "one billion, thirteen million, eight hundred thousand, seven hundred twenty".