78867001 has 2 divisors, whose sum is σ = 78867002. Its totient is φ = 78867000.

The previous prime is 78866999. The next prime is 78867077. The reversal of 78867001 is 10076887.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 71571600 + 7295401 = 8460^2 + 2701^2 .

It is an emirp because it is prime and its reverse (10076887) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 78867001 - 2¹ = 78866999 is a prime.

Together with 78866999, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (78867101) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39433500 + 39433501.

It is an arithmetic number, because the mean of its divisors is an integer number (39433501).

Almost surely, 2^78867001 is an apocalyptic number.

It is an amenable number.

78867001 is a deficient number, since it is larger than the sum of its proper divisors (1).

78867001 is an equidigital number, since it uses as much as digits as its factorization.

78867001 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 18816, while the sum is 37.

The square root of 78867001 is about 8880.7094874227. The cubic root of 78867001 is about 428.8431152608.

The spelling of 78867001 in words is "seventy-eight million, eight hundred sixty-seven thousand, one".