77427853 has 2 divisors, whose sum is σ = 77427854. Its totient is φ = 77427852.

The previous prime is 77427839. The next prime is 77427893. The reversal of 77427853 is 35872477.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 69006249 + 8421604 = 8307^2 + 2902^2 .

It is an emirp because it is prime and its reverse (35872477) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 77427853 - 2⁹ = 77427341 is a prime.

It is a super-3 number, since 3×77427853³ (a number of 25 digits) contains 333 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (77427893) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 38713926 + 38713927.

It is an arithmetic number, because the mean of its divisors is an integer number (38713927).

Almost surely, 2^77427853 is an apocalyptic number.

It is an amenable number.

77427853 is a deficient number, since it is larger than the sum of its proper divisors (1).

77427853 is an equidigital number, since it uses as much as digits as its factorization.

77427853 is an evil number, because the sum of its binary digits is even.

The product of its digits is 329280, while the sum is 43.

The square root of 77427853 is about 8799.3098024788. The cubic root of 77427853 is about 426.2186072631.

The spelling of 77427853 in words is "seventy-seven million, four hundred twenty-seven thousand, eight hundred fifty-three".