78707231 has 2 divisors, whose sum is σ = 78707232. Its totient is φ = 78707230.

The previous prime is 78707197. The next prime is 78707261. The reversal of 78707231 is 13270787.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 78707231 - 2¹⁴ = 78690847 is a prime.

It is a super-3 number, since 3×78707231³ (a number of 25 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a Sophie Germain prime.

It is a junction number, because it is equal to n+sod(n) for n = 78707191 and 78707200.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (78707261) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39353615 + 39353616.

It is an arithmetic number, because the mean of its divisors is an integer number (39353616).

Almost surely, 2^78707231 is an apocalyptic number.

78707231 is a deficient number, since it is larger than the sum of its proper divisors (1).

78707231 is an equidigital number, since it uses as much as digits as its factorization.

78707231 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 16464, while the sum is 35.

The square root of 78707231 is about 8871.7095872216. The cubic root of 78707231 is about 428.5533338022.

The spelling of 78707231 in words is "seventy-eight million, seven hundred seven thousand, two hundred thirty-one".