7928005 has 8 divisors (see below), whose sum is σ = 9693432. Its totient is φ = 6222528.

The previous prime is 7928003. The next prime is 7928021. The reversal of 7928005 is 5008297.

It can be written as a sum of positive squares in 4 ways, for example, as 3118756 + 4809249 = 1766^2 + 2193^2 .

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 7928005 - 2¹ = 7928003 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (7928003) 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 7 ways as a sum of consecutive naturals, for example, 14694 + ... + 15223.

It is an arithmetic number, because the mean of its divisors is an integer number (1211679).

Almost surely, 2^7928005 is an apocalyptic number.

It is an amenable number.

7928005 is a deficient number, since it is larger than the sum of its proper divisors (1765427).

7928005 is a wasteful number, since it uses less digits than its factorization.

7928005 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 29975.

The product of its (nonzero) digits is 5040, while the sum is 31.

The square root of 7928005 is about 2815.6713231484. The cubic root of 7928005 is about 199.3982328642.

The spelling of 7928005 in words is "seven million, nine hundred twenty-eight thousand, five".