78700001 has 2 divisors, whose sum is σ = 78700002. Its totient is φ = 78700000.

The previous prime is 78699977. The next prime is 78700003. The reversal of 78700001 is 10000787.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 47886400 + 30813601 = 6920^2 + 5551^2 .

It is a cyclic number.

It is not a de Polignac number, because 78700001 - 2¹⁸ = 78437857 is a prime.

It is a Sophie Germain prime.

Together with 78700003, it forms a pair of twin primes.

It is a Chen prime.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 78700001.

It is not a weakly prime, because it can be changed into another prime (78700003) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39350000 + 39350001.

It is an arithmetic number, because the mean of its divisors is an integer number (39350001).

Almost surely, 2^78700001 is an apocalyptic number.

It is an amenable number.

78700001 is a deficient number, since it is larger than the sum of its proper divisors (1).

78700001 is an equidigital number, since it uses as much as digits as its factorization.

78700001 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 392, while the sum is 23.

The square root of 78700001 is about 8871.3021028483. The cubic root of 78700001 is about 428.5402111812.

Adding to 78700001 its reverse (10000787), we get a palindrome (88700788).

The spelling of 78700001 in words is "seventy-eight million, seven hundred thousand, one".