78807401 has 2 divisors, whose sum is σ = 78807402. Its totient is φ = 78807400.

The previous prime is 78807367. The next prime is 78807409. The reversal of 78807401 is 10470887.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 78783376 + 24025 = 8876^2 + 155^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-78807401 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (78807409) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39403700 + 39403701.

It is an arithmetic number, because the mean of its divisors is an integer number (39403701).

Almost surely, 2^78807401 is an apocalyptic number.

It is an amenable number.

78807401 is a deficient number, since it is larger than the sum of its proper divisors (1).

78807401 is an equidigital number, since it uses as much as digits as its factorization.

78807401 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 12544, while the sum is 35.

The square root of 78807401 is about 8877.3532654728. The cubic root of 78807401 is about 428.7350620810.

The spelling of 78807401 in words is "seventy-eight million, eight hundred seven thousand, four hundred one".