79478789 has 4 divisors (see below), whose sum is σ = 85592556. Its totient is φ = 73365024.

The previous prime is 79478783. The next prime is 79478797. The reversal of 79478789 is 98787497.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 98787497 = 3547 ⋅27851.

It can be written as a sum of positive squares in 2 ways, for example, as 31730689 + 47748100 = 5633^2 + 6910^2 .

It is a cyclic number.

It is not a de Polignac number, because 79478789 - 2⁸ = 79478533 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 (79478783) 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, 3056864 + ... + 3056889.

It is an arithmetic number, because the mean of its divisors is an integer number (21398139).

Almost surely, 2^79478789 is an apocalyptic number.

It is an amenable number.

79478789 is a deficient number, since it is larger than the sum of its proper divisors (6113767).

79478789 is a wasteful number, since it uses less digits than its factorization.

79478789 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6113766.

The product of its digits is 7112448, while the sum is 59.

The square root of 79478789 is about 8915.0877168988. The cubic root of 79478789 is about 429.9491358621.

The spelling of 79478789 in words is "seventy-nine million, four hundred seventy-eight thousand, seven hundred eighty-nine".