1207720720 has 40 divisors (see below), whose sum is σ = 2809402776. Its totient is φ = 482838528.

The previous prime is 1207720673. The next prime is 1207720729. The reversal of 1207720720 is 270277021.

It can be written as a sum of positive squares in 4 ways, for example, as 162103824 + 1045616896 = 12732^2 + 32336^2 .

It is a tau number, because it is divible by the number of its divisors (40).

It is not an unprimeable number, because it can be changed into a prime (1207720729) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 280504 + ... + 284776.

Almost surely, 2^1207720720 is an apocalyptic number.

1207720720 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1207720720 is an abundant number, since it is smaller than the sum of its proper divisors (1601682056).

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

1207720720 is a wasteful number, since it uses less digits than its factorization.

1207720720 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7819 (or 7813 counting only the distinct ones).

The product of its (nonzero) digits is 2744, while the sum is 28.

The square root of 1207720720 is about 34752.2764721968. The cubic root of 1207720720 is about 1064.9327236775.

Adding to 1207720720 its reverse (270277021), we get a palindrome (1477997741).

The spelling of 1207720720 in words is "one billion, two hundred seven million, seven hundred twenty thousand, seven hundred twenty".