78605293 has 4 divisors (see below), whose sum is σ = 84651868. Its totient is φ = 72558720.

The previous prime is 78605239. The next prime is 78605309. The reversal of 78605293 is 39250687.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 23444964 + 55160329 = 4842^2 + 7427^2 .

It is not a de Polignac number, because 78605293 - 2⁹ = 78604781 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 (78605203) 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, 3023268 + ... + 3023293.

It is an arithmetic number, because the mean of its divisors is an integer number (21162967).

Almost surely, 2^78605293 is an apocalyptic number.

It is an amenable number.

78605293 is a deficient number, since it is larger than the sum of its proper divisors (6046575).

78605293 is a wasteful number, since it uses less digits than its factorization.

78605293 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6046574.

The product of its (nonzero) digits is 90720, while the sum is 40.

The square root of 78605293 is about 8865.9626098918. The cubic root of 78605293 is about 428.3682396554.

The spelling of 78605293 in words is "seventy-eight million, six hundred five thousand, two hundred ninety-three".