7420521620 has 48 divisors (see below), whose sum is σ = 15751520400. Its totient is φ = 2936217600.

The previous prime is 7420521601. The next prime is 7420521673. The reversal of 7420521620 is 261250247.

It is a happy number.

It can be written as a sum of positive squares in 8 ways, for example, as 137264656 + 7283256964 = 11716^2 + 85342^2 .

It is a super-2 number, since 2×7420521620² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1543220 + ... + 1548020.

It is an arithmetic number, because the mean of its divisors is an integer number (328156675).

Almost surely, 2^7420521620 is an apocalyptic number.

It is an amenable number.

7420521620 is an abundant number, since it is smaller than the sum of its proper divisors (8330998780).

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

7420521620 is a wasteful number, since it uses less digits than its factorization.

7420521620 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5628 (or 5626 counting only the distinct ones).

The product of its (nonzero) digits is 6720, while the sum is 29.

The square root of 7420521620 is about 86142.4495820731. The cubic root of 7420521620 is about 1950.4948662947.

Adding to 7420521620 its reverse (261250247), we get a palindrome (7681771867).

The spelling of 7420521620 in words is "seven billion, four hundred twenty million, five hundred twenty-one thousand, six hundred twenty".