78139603 has 4 divisors (see below), whose sum is σ = 79081128. Its totient is φ = 77198080.

The previous prime is 78139591. The next prime is 78139619. The reversal of 78139603 is 30693187.

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

It is a cyclic number.

It is not a de Polignac number, because 78139603 - 2⁹ = 78139091 is a prime.

It is a super-2 number, since 2×78139603² = 12211595113995218, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (78139673) 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, 470638 + ... + 470803.

It is an arithmetic number, because the mean of its divisors is an integer number (19770282).

Almost surely, 2^78139603 is an apocalyptic number.

78139603 is a deficient number, since it is larger than the sum of its proper divisors (941525).

78139603 is an equidigital number, since it uses as much as digits as its factorization.

78139603 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 941524.

The product of its (nonzero) digits is 27216, while the sum is 37.

The square root of 78139603 is about 8839.6607966596. The cubic root of 78139603 is about 427.5206205071.

The spelling of 78139603 in words is "seventy-eight million, one hundred thirty-nine thousand, six hundred three".