3505720720 has 40 divisors (see below), whose sum is σ = 8505187776. Its totient is φ = 1341318528.

The previous prime is 3505720657. The next prime is 3505720721. The reversal of 3505720720 is 270275053.

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 (3505720721) 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, 950802 + ... + 954481.

Almost surely, 2^3505720720 is an apocalyptic number.

It is an amenable number.

3505720720 is an abundant number, since it is smaller than the sum of its proper divisors (4999467056).

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

3505720720 is a wasteful number, since it uses less digits than its factorization.

3505720720 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1905319 (or 1905313 counting only the distinct ones).

The product of its (nonzero) digits is 14700, while the sum is 31.

The square root of 3505720720 is about 59209.1269991376. The cubic root of 3505720720 is about 1519.1212487635.

Adding to 3505720720 its reverse (270275053), we get a palindrome (3775995773).

The spelling of 3505720720 in words is "three billion, five hundred five million, seven hundred twenty thousand, seven hundred twenty".