77634538 has 4 divisors (see below), whose sum is σ = 116451810. Its totient is φ = 38817268.

The previous prime is 77634533. The next prime is 77634539. The reversal of 77634538 is 83543677.

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., 77563249 + 71289 = 8807^2 + 267^2 .

It is a junction number, because it is equal to n+sod(n) for n = 77634494 and 77634503.

It is not an unprimeable number, because it can be changed into a prime (77634533) 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, 19408633 + ... + 19408636.

Almost surely, 2^77634538 is an apocalyptic number.

77634538 is a deficient number, since it is larger than the sum of its proper divisors (38817272).

77634538 is a wasteful number, since it uses less digits than its factorization.

77634538 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 38817271.

The product of its digits is 423360, while the sum is 43.

The square root of 77634538 is about 8811.0463623794. The cubic root of 77634538 is about 426.5975179551.

The spelling of 77634538 in words is "seventy-seven million, six hundred thirty-four thousand, five hundred thirty-eight".