1011200720 has 20 divisors (see below), whose sum is σ = 2351041860. Its totient is φ = 404480256.

The previous prime is 1011200719. The next prime is 1011200731. The reversal of 1011200720 is 270021101.

It can be written as a sum of positive squares in 2 ways, for example, as 610880656 + 400320064 = 24716^2 + 20008^2 .

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

It is a super-2 number, since 2×1011200720² = 2045053792257036800, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 1011200695 and 1011200704.

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, 6319925 + ... + 6320084.

It is an arithmetic number, because the mean of its divisors is an integer number (117552093).

Almost surely, 2^1011200720 is an apocalyptic number.

1011200720 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1011200720 is an abundant number, since it is smaller than the sum of its proper divisors (1339841140).

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

1011200720 is a wasteful number, since it uses less digits than its factorization.

1011200720 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12640022 (or 12640016 counting only the distinct ones).

The product of its (nonzero) digits is 28, while the sum is 14.

The square root of 1011200720 is about 31799.3823839395. The cubic root of 1011200720 is about 1003.7197198617.

Adding to 1011200720 its reverse (270021101), we get a palindrome (1281221821).

The spelling of 1011200720 in words is "one billion, eleven million, two hundred thousand, seven hundred twenty".