78104401 has 2 divisors, whose sum is σ = 78104402. Its totient is φ = 78104400.

The previous prime is 78104371. The next prime is 78104413. The reversal of 78104401 is 10440187.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 73942801 + 4161600 = 8599^2 + 2040^2 .

It is a cyclic number.

It is not a de Polignac number, because 78104401 - 2¹³ = 78096209 is a prime.

It is a super-2 number, since 2×78104401² = 12200594911137602, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (78104431) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39052200 + 39052201.

It is an arithmetic number, because the mean of its divisors is an integer number (39052201).

Almost surely, 2^78104401 is an apocalyptic number.

It is an amenable number.

78104401 is a deficient number, since it is larger than the sum of its proper divisors (1).

78104401 is an equidigital number, since it uses as much as digits as its factorization.

78104401 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 896, while the sum is 25.

The square root of 78104401 is about 8837.6694326050. The cubic root of 78104401 is about 427.4564113190.

Adding to 78104401 its reverse (10440187), we get a palindrome (88544588).

The spelling of 78104401 in words is "seventy-eight million, one hundred four thousand, four hundred one".