7287746621 has 8 divisors (see below), whose sum is σ = 7317305688. Its totient is φ = 7258248000.

The previous prime is 7287746617. The next prime is 7287746639. The reversal of 7287746621 is 1266477827.

It can be written as a sum of positive squares in 4 ways, for example, as 30580900 + 7257165721 = 5530^2 + 85189^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 7287746621 - 2² = 7287746617 is a prime.

It is a super-2 number, since 2×7287746621² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 7287746621.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (7287746671) 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, 234791 + ... + 264011.

It is an arithmetic number, because the mean of its divisors is an integer number (914663211).

Almost surely, 2^7287746621 is an apocalyptic number.

It is an amenable number.

7287746621 is a deficient number, since it is larger than the sum of its proper divisors (29559067).

7287746621 is a wasteful number, since it uses less digits than its factorization.

7287746621 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 30223.

The product of its digits is 1580544, while the sum is 50.

The square root of 7287746621 is about 85368.2998600769. The cubic root of 7287746621 is about 1938.7914161652.

The spelling of 7287746621 in words is "seven billion, two hundred eighty-seven million, seven hundred forty-six thousand, six hundred twenty-one".