78000001 has 2 divisors, whose sum is σ = 78000002. Its totient is φ = 78000000.

The previous prime is 77999951. The next prime is 78000011. The reversal of 78000001 is 10000087.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 77422401 + 577600 = 8799^2 + 760^2 .

It is a cyclic number.

It is not a de Polignac number, because 78000001 - 2⁹ = 77999489 is a prime.

It is not a weakly prime, because it can be changed into another prime (78000011) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39000000 + 39000001.

It is an arithmetic number, because the mean of its divisors is an integer number (39000001).

Almost surely, 2^78000001 is an apocalyptic number.

It is an amenable number.

78000001 is a deficient number, since it is larger than the sum of its proper divisors (1).

78000001 is an equidigital number, since it uses as much as digits as its factorization.

78000001 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 56, while the sum is 16.

The square root of 78000001 is about 8831.7609229417. The cubic root of 78000001 is about 427.2658699957.

Adding to 78000001 its reverse (10000087), we get a palindrome (88000088).

It can be divided in two parts, 7 and 8000001, that added together give a palindrome (8000008).

The spelling of 78000001 in words is "seventy-eight million, one", and thus it is an aban number and an uban number.