7280824321 has 4 divisors (see below), whose sum is σ = 7458405444. Its totient is φ = 7103243200.

The previous prime is 7280824319. The next prime is 7280824337. The reversal of 7280824321 is 1234280827.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 4162830400 + 3117993921 = 64520^2 + 55839^2 .

It is a cyclic number.

It is not a de Polignac number, because 7280824321 - 2¹ = 7280824319 is a prime.

It is a super-2 number, since 2×7280824321² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (7280824351) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 88790500 + ... + 88790581.

It is an arithmetic number, because the mean of its divisors is an integer number (1864601361).

Almost surely, 2^7280824321 is an apocalyptic number.

It is an amenable number.

7280824321 is a deficient number, since it is larger than the sum of its proper divisors (177581123).

7280824321 is a wasteful number, since it uses less digits than its factorization.

7280824321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 177581122.

The product of its (nonzero) digits is 43008, while the sum is 37.

The square root of 7280824321 is about 85327.7464896384. The cubic root of 7280824321 is about 1938.1773650251.

The spelling of 7280824321 in words is "seven billion, two hundred eighty million, eight hundred twenty-four thousand, three hundred twenty-one".