77657434 has 4 divisors (see below), whose sum is σ = 116486154. Its totient is φ = 38828716.

The previous prime is 77657431. The next prime is 77657443. The reversal of 77657434 is 43475677.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 61230625 + 16426809 = 7825^2 + 4053^2 .

It is not an unprimeable number, because it can be changed into a prime (77657431) 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, 19414357 + ... + 19414360.

Almost surely, 2^77657434 is an apocalyptic number.

77657434 is a deficient number, since it is larger than the sum of its proper divisors (38828720).

77657434 is a wasteful number, since it uses less digits than its factorization.

77657434 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 38828719.

The product of its digits is 493920, while the sum is 43.

The square root of 77657434 is about 8812.3455447457. The cubic root of 77657434 is about 426.6394512534.

The spelling of 77657434 in words is "seventy-seven million, six hundred fifty-seven thousand, four hundred thirty-four".