78868901 has 2 divisors, whose sum is σ = 78868902. Its totient is φ = 78868900.

The previous prime is 78868897. The next prime is 78868903. The reversal of 78868901 is 10986887.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 45576001 + 33292900 = 6751^2 + 5770^2 .

It is a cyclic number.

It is not a de Polignac number, because 78868901 - 2² = 78868897 is a prime.

Together with 78868903, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (78868903) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39434450 + 39434451.

It is an arithmetic number, because the mean of its divisors is an integer number (39434451).

Almost surely, 2^78868901 is an apocalyptic number.

It is an amenable number.

78868901 is a deficient number, since it is larger than the sum of its proper divisors (1).

78868901 is an equidigital number, since it uses as much as digits as its factorization.

78868901 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 193536, while the sum is 47.

The square root of 78868901 is about 8880.8164602136. The cubic root of 78868901 is about 428.8465590137.

The spelling of 78868901 in words is "seventy-eight million, eight hundred sixty-eight thousand, nine hundred one".