77423386 has 4 divisors (see below), whose sum is σ = 116135082. Its totient is φ = 38711692.

The previous prime is 77423377. The next prime is 77423387. The reversal of 77423386 is 68332477.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 68332477 = 127 ⋅538051.

It can be written as a sum of positive squares in only one way, i.e., 63696361 + 13727025 = 7981^2 + 3705^2 .

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is not an unprimeable number, because it can be changed into a prime (77423387) 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, 19355845 + ... + 19355848.

Almost surely, 2^77423386 is an apocalyptic number.

77423386 is a deficient number, since it is larger than the sum of its proper divisors (38711696).

77423386 is a wasteful number, since it uses less digits than its factorization.

77423386 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 38711695.

The product of its digits is 169344, while the sum is 40.

The square root of 77423386 is about 8799.0559720916. The cubic root of 77423386 is about 426.2104105782.

Subtracting from 77423386 its reverse (68332477), we obtain a palindrome (9090909).

The spelling of 77423386 in words is "seventy-seven million, four hundred twenty-three thousand, three hundred eighty-six".