77689453 has 2 divisors, whose sum is σ = 77689454. Its totient is φ = 77689452.

The previous prime is 77689429. The next prime is 77689471. The reversal of 77689453 is 35498677.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 59182249 + 18507204 = 7693^2 + 4302^2 .

It is a cyclic number.

It is not a de Polignac number, because 77689453 - 2¹⁷ = 77558381 is a prime.

It is a super-2 number, since 2×77689453² = 12071302214878418, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 77689397 and 77689406.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (77683453) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 38844726 + 38844727.

It is an arithmetic number, because the mean of its divisors is an integer number (38844727).

Almost surely, 2^77689453 is an apocalyptic number.

It is an amenable number.

77689453 is a deficient number, since it is larger than the sum of its proper divisors (1).

77689453 is an equidigital number, since it uses as much as digits as its factorization.

77689453 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1270080, while the sum is 49.

The square root of 77689453 is about 8814.1620702140. The cubic root of 77689453 is about 426.6980792167.

The spelling of 77689453 in words is "seventy-seven million, six hundred eighty-nine thousand, four hundred fifty-three".