7928200561 has 4 divisors (see below), whose sum is σ = 8058171124. Its totient is φ = 7798230000.

The previous prime is 7928200537. The next prime is 7928200573. The reversal of 7928200561 is 1650028297.

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 249008400 + 7679192161 = 15780^2 + 87631^2 .

It is a cyclic number.

It is not a de Polignac number, because 7928200561 - 2²³ = 7919811953 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (7928200961) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 64985190 + ... + 64985311.

It is an arithmetic number, because the mean of its divisors is an integer number (2014542781).

Almost surely, 2^7928200561 is an apocalyptic number.

It is an amenable number.

7928200561 is a deficient number, since it is larger than the sum of its proper divisors (129970563).

7928200561 is a wasteful number, since it uses less digits than its factorization.

7928200561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 129970562.

The product of its (nonzero) digits is 60480, while the sum is 40.

The square root of 7928200561 is about 89040.4434007378. The cubic root of 7928200561 is about 1993.9987237700.

The spelling of 7928200561 in words is "seven billion, nine hundred twenty-eight million, two hundred thousand, five hundred sixty-one".