78008401 has 2 divisors, whose sum is σ = 78008402. Its totient is φ = 78008400.

The previous prime is 78008383. The next prime is 78008449. The reversal of 78008401 is 10480087.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 52998400 + 25010001 = 7280^2 + 5001^2 .

It is an emirp because it is prime and its reverse (10480087) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 78008401 - 2⁹ = 78007889 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 78008401.

It is not a weakly prime, because it can be changed into another prime (78018401) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39004200 + 39004201.

It is an arithmetic number, because the mean of its divisors is an integer number (39004201).

Almost surely, 2^78008401 is an apocalyptic number.

It is an amenable number.

78008401 is a deficient number, since it is larger than the sum of its proper divisors (1).

78008401 is an equidigital number, since it uses as much as digits as its factorization.

78008401 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1792, while the sum is 28.

The square root of 78008401 is about 8832.2364664902. The cubic root of 78008401 is about 427.2812071941.

Adding to 78008401 its reverse (10480087), we get a palindrome (88488488).

The spelling of 78008401 in words is "seventy-eight million, eight thousand, four hundred one".