78254317 has 4 divisors (see below), whose sum is σ = 78319836. Its totient is φ = 78188800.

The previous prime is 78254287. The next prime is 78254327. The reversal of 78254317 is 71345287.

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 26687556 + 51566761 = 5166^2 + 7181^2 .

It is a cyclic number.

It is not a de Polignac number, because 78254317 - 2¹¹ = 78252269 is a prime.

It is a super-2 number, since 2×78254317² = 12247476258272978, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78254327) 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, 30934 + ... + 33367.

It is an arithmetic number, because the mean of its divisors is an integer number (19579959).

Almost surely, 2^78254317 is an apocalyptic number.

It is an amenable number.

78254317 is a deficient number, since it is larger than the sum of its proper divisors (65519).

78254317 is a wasteful number, since it uses less digits than its factorization.

78254317 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 65518.

The product of its digits is 47040, while the sum is 37.

The square root of 78254317 is about 8846.1470143786. The cubic root of 78254317 is about 427.7297275365.

The spelling of 78254317 in words is "seventy-eight million, two hundred fifty-four thousand, three hundred seventeen".