799978547 has 4 divisors (see below), whose sum is σ = 808967160. Its totient is φ = 790989936.

The previous prime is 799978519. The next prime is 799978561. The reversal of 799978547 is 745879997.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 745879997 = 10133 ⋅73609.

It is a cyclic number.

It is not a de Polignac number, because 799978547 - 2²² = 795784243 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (799978567) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4494173 + ... + 4494350.

It is an arithmetic number, because the mean of its divisors is an integer number (202241790).

Almost surely, 2^799978547 is an apocalyptic number.

799978547 is a deficient number, since it is larger than the sum of its proper divisors (8988613).

799978547 is an equidigital number, since it uses as much as digits as its factorization.

799978547 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8988612.

The product of its digits is 40007520, while the sum is 65.

The square root of 799978547 is about 28283.8920058750. The cubic root of 799978547 is about 928.3094686479.

The spelling of 799978547 in words is "seven hundred ninety-nine million, nine hundred seventy-eight thousand, five hundred forty-seven".