78297793 has 4 divisors (see below), whose sum is σ = 89483200. Its totient is φ = 67112388.

The previous prime is 78297781. The next prime is 78297827. The reversal of 78297793 is 39779287.

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: 39779287 = 1303 ⋅30529.

It is not a de Polignac number, because 78297793 - 2⁵ = 78297761 is a prime.

It is a super-2 number, since 2×78297793² = 12261088777341698, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 78297793.

It is not an unprimeable number, because it can be changed into a prime (78297763) 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, 5592693 + ... + 5592706.

It is an arithmetic number, because the mean of its divisors is an integer number (22370800).

Almost surely, 2^78297793 is an apocalyptic number.

It is an amenable number.

78297793 is a deficient number, since it is larger than the sum of its proper divisors (11185407).

78297793 is a wasteful number, since it uses less digits than its factorization.

78297793 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11185406.

The product of its digits is 1333584, while the sum is 52.

The square root of 78297793 is about 8848.6040141934. The cubic root of 78297793 is about 427.8089245938.

The spelling of 78297793 in words is "seventy-eight million, two hundred ninety-seven thousand, seven hundred ninety-three".