78257793 has 4 divisors (see below), whose sum is σ = 104343728. Its totient is φ = 52171860.

The previous prime is 78257771. The next prime is 78257801. The reversal of 78257793 is 39775287.

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.

It is not a de Polignac number, because 78257793 - 2⁹ = 78257281 is a prime.

It is a super-2 number, since 2×78257793² = 12248564330461698, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (78250793) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 13042963 + ... + 13042968.

It is an arithmetic number, because the mean of its divisors is an integer number (26085932).

Almost surely, 2^78257793 is an apocalyptic number.

It is an amenable number.

78257793 is a deficient number, since it is larger than the sum of its proper divisors (26085935).

78257793 is a wasteful number, since it uses less digits than its factorization.

78257793 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26085934.

The product of its digits is 740880, while the sum is 48.

The square root of 78257793 is about 8846.3434819139. The cubic root of 78257793 is about 427.7360605908.

The spelling of 78257793 in words is "seventy-eight million, two hundred fifty-seven thousand, seven hundred ninety-three".