79928617 has 2 divisors, whose sum is σ = 79928618. Its totient is φ = 79928616.

The previous prime is 79928609. The next prime is 79928647. The reversal of 79928617 is 71682997.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 68293696 + 11634921 = 8264^2 + 3411^2 .

It is an emirp because it is prime and its reverse (71682997) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 79928617 - 2³ = 79928609 is a prime.

It is a super-3 number, since 3×79928617³ (a number of 25 digits) contains 333 as substring.

It is not a weakly prime, because it can be changed into another prime (79928647) 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 as a sum of consecutive naturals, namely, 39964308 + 39964309.

It is an arithmetic number, because the mean of its divisors is an integer number (39964309).

Almost surely, 2^79928617 is an apocalyptic number.

It is an amenable number.

79928617 is a deficient number, since it is larger than the sum of its proper divisors (1).

79928617 is an equidigital number, since it uses as much as digits as its factorization.

79928617 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 381024, while the sum is 49.

The square root of 79928617 is about 8940.2805884379. The cubic root of 79928617 is about 430.7587415265.

The spelling of 79928617 in words is "seventy-nine million, nine hundred twenty-eight thousand, six hundred seventeen".