78803997 has 4 divisors (see below), whose sum is σ = 105072000. Its totient is φ = 52535996.

The previous prime is 78803987. The next prime is 78804013. The reversal of 78803997 is 79930887.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 79930887 = 3 ⋅26643629.

It is a cyclic number.

It is not a de Polignac number, because 78803997 - 2⁷ = 78803869 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78803947) 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, 13133997 + ... + 13134002.

It is an arithmetic number, because the mean of its divisors is an integer number (26268000).

Almost surely, 2^78803997 is an apocalyptic number.

It is an amenable number.

78803997 is a deficient number, since it is larger than the sum of its proper divisors (26268003).

78803997 is a wasteful number, since it uses less digits than its factorization.

78803997 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26268002.

The product of its (nonzero) digits is 762048, while the sum is 51.

The square root of 78803997 is about 8877.1615395914. The cubic root of 78803997 is about 428.7288890772.

It can be divided in two parts, 78803 and 997, that added together give a triangular number (79800 = T₃₉₉).

The spelling of 78803997 in words is "seventy-eight million, eight hundred three thousand, nine hundred ninety-seven".