78538349 has 4 divisors (see below), whose sum is σ = 78587964. Its totient is φ = 78488736.

The previous prime is 78538337. The next prime is 78538373. The reversal of 78538349 is 94383587.

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 44689225 + 33849124 = 6685^2 + 5818^2 .

It is a cyclic number.

It is not a de Polignac number, because 78538349 - 2⁴ = 78538333 is a prime.

It is a super-3 number, since 3×78538349³ (a number of 25 digits) contains 333 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 (78538319) 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, 22352 + ... + 25625.

It is an arithmetic number, because the mean of its divisors is an integer number (19646991).

Almost surely, 2^78538349 is an apocalyptic number.

It is an amenable number.

78538349 is a deficient number, since it is larger than the sum of its proper divisors (49615).

78538349 is a wasteful number, since it uses less digits than its factorization.

78538349 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 49614.

The product of its digits is 725760, while the sum is 47.

The square root of 78538349 is about 8862.1864683610. The cubic root of 78538349 is about 428.2465988727.

It can be divided in two parts, 78538 and 349, that added together give a palindrome (78887).

The spelling of 78538349 in words is "seventy-eight million, five hundred thirty-eight thousand, three hundred forty-nine".