7240720653 has 20 divisors (see below), whose sum is σ = 10827102748. Its totient is φ = 4822364160.

The previous prime is 7240720649. The next prime is 7240720673. The reversal of 7240720653 is 3560270427.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 4950811044 + 2289909609 = 70362^2 + 47853^2 .

It is not a de Polignac number, because 7240720653 - 2² = 7240720649 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (7240720673) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 38925 + ... + 126477.

Almost surely, 2^7240720653 is an apocalyptic number.

It is an amenable number.

7240720653 is a deficient number, since it is larger than the sum of its proper divisors (3586382095).

7240720653 is a wasteful number, since it uses less digits than its factorization.

7240720653 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 88586 (or 88577 counting only the distinct ones).

The product of its (nonzero) digits is 70560, while the sum is 36.

The square root of 7240720653 is about 85092.4241810045. The cubic root of 7240720653 is about 1934.6122388680.

The spelling of 7240720653 in words is "seven billion, two hundred forty million, seven hundred twenty thousand, six hundred fifty-three".