77691508 has 6 divisors (see below), whose sum is σ = 135960146. Its totient is φ = 38845752.

The previous prime is 77691503. The next prime is 77691529. The reversal of 77691508 is 80519677.

It can be written as a sum of positive squares in only one way, i.e., 42146064 + 35545444 = 6492^2 + 5962^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (77691503) 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, 9711435 + ... + 9711442.

Almost surely, 2^77691508 is an apocalyptic number.

It is an amenable number.

77691508 is a deficient number, since it is larger than the sum of its proper divisors (58268638).

77691508 is a wasteful number, since it uses less digits than its factorization.

77691508 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19422881 (or 19422879 counting only the distinct ones).

The product of its (nonzero) digits is 105840, while the sum is 43.

The square root of 77691508 is about 8814.2786432016. The cubic root of 77691508 is about 426.7018414469.

The spelling of 77691508 in words is "seventy-seven million, six hundred ninety-one thousand, five hundred eight".