78131267 has 2 divisors, whose sum is σ = 78131268. Its totient is φ = 78131266.

The previous prime is 78131257. The next prime is 78131323. The reversal of 78131267 is 76213187.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 78131267 - 2¹² = 78127171 is a prime.

It is a super-2 number, since 2×78131267² = 12208989766050578, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (78131257) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39065633 + 39065634.

It is an arithmetic number, because the mean of its divisors is an integer number (39065634).

Almost surely, 2^78131267 is an apocalyptic number.

78131267 is a deficient number, since it is larger than the sum of its proper divisors (1).

78131267 is an equidigital number, since it uses as much as digits as its factorization.

78131267 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 14112, while the sum is 35.

The square root of 78131267 is about 8839.1892727784. The cubic root of 78131267 is about 427.5054172107.

The spelling of 78131267 in words is "seventy-eight million, one hundred thirty-one thousand, two hundred sixty-seven".