79928647 has 2 divisors, whose sum is σ = 79928648. Its totient is φ = 79928646.

The previous prime is 79928617. The next prime is 79928663. The reversal of 79928647 is 74682997.

It is a strong prime.

It is an emirp because it is prime and its reverse (74682997) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 79928647 - 2¹¹ = 79926599 is a prime.

It is a super-2 number, since 2×79928647² = 12777177222501218, which contains 22 as substring.

It is a nialpdrome in base 14.

It is a junction number, because it is equal to n+sod(n) for n = 79928594 and 79928603.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (79928617) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39964323 + 39964324.

It is an arithmetic number, because the mean of its divisors is an integer number (39964324).

Almost surely, 2^79928647 is an apocalyptic number.

79928647 is a deficient number, since it is larger than the sum of its proper divisors (1).

79928647 is an equidigital number, since it uses as much as digits as its factorization.

79928647 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1524096, while the sum is 52.

The square root of 79928647 is about 8940.2822662375. The cubic root of 79928647 is about 430.7587954195.

The spelling of 79928647 in words is "seventy-nine million, nine hundred twenty-eight thousand, six hundred forty-seven".