786278401 has 4 divisors (see below), whose sum is σ = 797049412. Its totient is φ = 775507392.

The previous prime is 786278377. The next prime is 786278459. The reversal of 786278401 is 104872687.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 104872687 = 7541 ⋅13907.

It can be written as a sum of positive squares in 2 ways, for example, as 333610225 + 452668176 = 18265^2 + 21276^2 .

It is a cyclic number.

It is not a de Polignac number, because 786278401 - 2⁹ = 786277889 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (786278461) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5385396 + ... + 5385541.

It is an arithmetic number, because the mean of its divisors is an integer number (199262353).

Almost surely, 2^786278401 is an apocalyptic number.

It is an amenable number.

786278401 is a deficient number, since it is larger than the sum of its proper divisors (10771011).

786278401 is a wasteful number, since it uses less digits than its factorization.

786278401 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10771010.

The product of its (nonzero) digits is 150528, while the sum is 43.

The square root of 786278401 is about 28040.6562155738. The cubic root of 786278401 is about 922.9796277432.

The spelling of 786278401 in words is "seven hundred eighty-six million, two hundred seventy-eight thousand, four hundred one".