78774001 has 2 divisors, whose sum is σ = 78774002. Its totient is φ = 78774000.

The previous prime is 78773969. The next prime is 78774029. The reversal of 78774001 is 10047787.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 64786401 + 13987600 = 8049^2 + 3740^2 .

It is an emirp because it is prime and its reverse (10047787) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 78774001 - 2⁵ = 78773969 is a prime.

It is not a weakly prime, because it can be changed into another prime (78774061) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39387000 + 39387001.

It is an arithmetic number, because the mean of its divisors is an integer number (39387001).

Almost surely, 2^78774001 is an apocalyptic number.

It is an amenable number.

78774001 is a deficient number, since it is larger than the sum of its proper divisors (1).

78774001 is an equidigital number, since it uses as much as digits as its factorization.

78774001 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 10976, while the sum is 34.

The square root of 78774001 is about 8875.4718747794. The cubic root of 78774001 is about 428.6744849679.

The spelling of 78774001 in words is "seventy-eight million, seven hundred seventy-four thousand, one".