7379128521 has 12 divisors (see below), whose sum is σ = 10663443700. Its totient is φ = 4917248640.

The previous prime is 7379128517. The next prime is 7379128531. The reversal of 7379128521 is 1258219737.

7379128521 is a `hidden beast` number, since 7 + 37 + 91 + 2 + 8 + 521 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 2818017225 + 4561111296 = 53085^2 + 67536^2 .

It is not a de Polignac number, because 7379128521 - 2² = 7379128517 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (7379128531) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 159196 + ... + 200253.

Almost surely, 2^7379128521 is an apocalyptic number.

It is an amenable number.

7379128521 is a deficient number, since it is larger than the sum of its proper divisors (3284315179).

7379128521 is a wasteful number, since it uses less digits than its factorization.

7379128521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 361736 (or 361733 counting only the distinct ones).

The product of its digits is 211680, while the sum is 45.

The square root of 7379128521 is about 85901.8540021110. The cubic root of 7379128521 is about 1946.8613563953.

The spelling of 7379128521 in words is "seven billion, three hundred seventy-nine million, one hundred twenty-eight thousand, five hundred twenty-one".