77891536 has 10 divisors (see below), whose sum is σ = 150914882. Its totient is φ = 38945760.

The previous prime is 77891531. The next prime is 77891563. The reversal of 77891536 is 63519877.

It can be written as a sum of positive squares in only one way, i.e., 41216400 + 36675136 = 6420^2 + 6056^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (77891531) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2434095 + ... + 2434126.

Almost surely, 2^77891536 is an apocalyptic number.

It is an amenable number.

77891536 is a deficient number, since it is larger than the sum of its proper divisors (73023346).

77891536 is a wasteful number, since it uses less digits than its factorization.

77891536 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4868229 (or 4868223 counting only the distinct ones).

The product of its digits is 317520, while the sum is 46.

The square root of 77891536 is about 8825.6181653185. The cubic root of 77891536 is about 427.0677294403.

The spelling of 77891536 in words is "seventy-seven million, eight hundred ninety-one thousand, five hundred thirty-six".