78531207 has 4 divisors (see below), whose sum is σ = 104708280. Its totient is φ = 52354136.

The previous prime is 78531191. The next prime is 78531209. The reversal of 78531207 is 70213587.

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 78531207 - 2⁴ = 78531191 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78531209) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 13088532 + ... + 13088537.

It is an arithmetic number, because the mean of its divisors is an integer number (26177070).

Almost surely, 2^78531207 is an apocalyptic number.

78531207 is a deficient number, since it is larger than the sum of its proper divisors (26177073).

78531207 is a wasteful number, since it uses less digits than its factorization.

78531207 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26177072.

The product of its (nonzero) digits is 11760, while the sum is 33.

The square root of 78531207 is about 8861.7835112352. The cubic root of 78531207 is about 428.2336174016.

The spelling of 78531207 in words is "seventy-eight million, five hundred thirty-one thousand, two hundred seven".