78170867 has 2 divisors, whose sum is σ = 78170868. Its totient is φ = 78170866.

The previous prime is 78170849. The next prime is 78170881. The reversal of 78170867 is 76807187.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 78170867 - 2⁶ = 78170803 is a prime.

It is a super-2 number, since 2×78170867² = 12221368895063378, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (78170837) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39085433 + 39085434.

It is an arithmetic number, because the mean of its divisors is an integer number (39085434).

Almost surely, 2^78170867 is an apocalyptic number.

78170867 is a deficient number, since it is larger than the sum of its proper divisors (1).

78170867 is an equidigital number, since it uses as much as digits as its factorization.

78170867 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 131712, while the sum is 44.

The square root of 78170867 is about 8841.4290134570. The cubic root of 78170867 is about 427.5776305335.

The spelling of 78170867 in words is "seventy-eight million, one hundred seventy thousand, eight hundred sixty-seven".