78520103 has 4 divisors (see below), whose sum is σ = 82652760. Its totient is φ = 74387448.

The previous prime is 78520097. The next prime is 78520109. The reversal of 78520103 is 30102587.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 30102587 = 241 ⋅124907.

It is an interprime number because it is at equal distance from previous prime (78520097) and next prime (78520109).

It is a cyclic number.

It is not a de Polignac number, because 78520103 - 2⁴ = 78520087 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 (78520109) 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, 2066300 + ... + 2066337.

It is an arithmetic number, because the mean of its divisors is an integer number (20663190).

Almost surely, 2^78520103 is an apocalyptic number.

78520103 is a deficient number, since it is larger than the sum of its proper divisors (4132657).

78520103 is a wasteful number, since it uses less digits than its factorization.

78520103 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4132656.

The product of its (nonzero) digits is 1680, while the sum is 26.

The square root of 78520103 is about 8861.1569786343. The cubic root of 78520103 is about 428.2134329407.

The spelling of 78520103 in words is "seventy-eight million, five hundred twenty thousand, one hundred three".