78491293 has 4 divisors (see below), whose sum is σ = 78522208. Its totient is φ = 78460380.

The previous prime is 78491239. The next prime is 78491359. The reversal of 78491293 is 39219487.

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 a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-78491293 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 (78491213) 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, 11271 + ... + 16852.

It is an arithmetic number, because the mean of its divisors is an integer number (19630552).

Almost surely, 2^78491293 is an apocalyptic number.

It is an amenable number.

78491293 is a deficient number, since it is larger than the sum of its proper divisors (30915).

78491293 is a wasteful number, since it uses less digits than its factorization.

78491293 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30914.

The product of its digits is 108864, while the sum is 43.

The square root of 78491293 is about 8859.5311952721. The cubic root of 78491293 is about 428.1610542602.

The spelling of 78491293 in words is "seventy-eight million, four hundred ninety-one thousand, two hundred ninety-three".