799128509 has 12 divisors (see below), whose sum is σ = 840159360. Its totient is φ = 759092400.

The previous prime is 799128431. The next prime is 799128511. The reversal of 799128509 is 905821997.

It is a happy number.

It is a de Polignac number, because none of the positive numbers 2^k-799128509 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 (799128599) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1208639 + ... + 1209299.

It is an arithmetic number, because the mean of its divisors is an integer number (70013280).

Almost surely, 2^799128509 is an apocalyptic number.

It is an amenable number.

799128509 is a deficient number, since it is larger than the sum of its proper divisors (41030851).

799128509 is an frugal number, since it uses more digits than its factorization.

799128509 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1412 (or 751 counting only the distinct ones).

The product of its (nonzero) digits is 408240, while the sum is 50.

The square root of 799128509 is about 28268.8611196136. The cubic root of 799128509 is about 927.9805523353.

The spelling of 799128509 in words is "seven hundred ninety-nine million, one hundred twenty-eight thousand, five hundred nine".