78944797 has 4 divisors (see below), whose sum is σ = 80239036. Its totient is φ = 77650560.

The previous prime is 78944783. The next prime is 78944837. The reversal of 78944797 is 79744987.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 79744987 = 7 ⋅11392141.

It can be written as a sum of positive squares in 2 ways, for example, as 8031556 + 70913241 = 2834^2 + 8421^2 .

It is not a de Polignac number, because 78944797 - 2¹⁹ = 78420509 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 (78944737) 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 in 3 ways as a sum of consecutive naturals, for example, 647028 + ... + 647149.

It is an arithmetic number, because the mean of its divisors is an integer number (20059759).

Almost surely, 2^78944797 is an apocalyptic number.

It is an amenable number.

78944797 is a deficient number, since it is larger than the sum of its proper divisors (1294239).

78944797 is a wasteful number, since it uses less digits than its factorization.

78944797 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1294238.

The product of its digits is 3556224, while the sum is 55.

The square root of 78944797 is about 8885.0884632625. The cubic root of 78944797 is about 428.9840754209.

The spelling of 78944797 in words is "seventy-eight million, nine hundred forty-four thousand, seven hundred ninety-seven".