78494401 has 2 divisors, whose sum is σ = 78494402. Its totient is φ = 78494400.

The previous prime is 78494399. The next prime is 78494413. The reversal of 78494401 is 10449487.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 77018176 + 1476225 = 8776^2 + 1215^2 .

It is a cyclic number.

It is not a de Polignac number, because 78494401 - 2¹ = 78494399 is a prime.

It is a super-2 number, since 2×78494401² = 12322741976697602, which contains 22 as substring.

Together with 78494399, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (78494441) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39247200 + 39247201.

It is an arithmetic number, because the mean of its divisors is an integer number (39247201).

Almost surely, 2^78494401 is an apocalyptic number.

It is an amenable number.

78494401 is a deficient number, since it is larger than the sum of its proper divisors (1).

78494401 is an equidigital number, since it uses as much as digits as its factorization.

78494401 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 32256, while the sum is 37.

The square root of 78494401 is about 8859.7065978507. The cubic root of 78494401 is about 428.1667054475.

The spelling of 78494401 in words is "seventy-eight million, four hundred ninety-four thousand, four hundred one".